Doctor Eggman

Doctor Ivo Robotnik (ドクター・イヴォ・ロボトニック Dokutā Ivo Robotonikku?), better known by the alias Doctor Eggman (ドクター・エッグマン Dokutā Egguman?), is the main antagonist of the Sonic the Hedgehog series. He is a human scientist who boasts a remarkable IQ of 300 and a passion for machines. Eggman dreams of conquering the world to establish a global empire to build his utopia, Eggmanland. For all his brilliance though, his plans are constantly foiled by his arch-nemesis, Sonic the Hedgehog, and his friends.

Never discouraged by his defeats, Eggman is always able to come up with a seemingly endless supply of plots to make his ambitions a reality. His ambitions and schemes ever growing, his plans have varied from using Animals to power his robots to making incredibly dangerous global threats that have involved building war machines, using doomsday devices to threaten entire nations, and relying on ancient mythological deities or eldritch abominations bent on destruction, all in the name of achieving his goals. At times, Eggman has even gone as far as to target the entire universe and hatched schemes to control spacetime itself.

While all of these plans end in failure due to the continued efforts of Sonic and his friends, the mad doctor is somehow always able to slip away from certain death or imprisonment and escape at the last moment. Eggman's immature character and self-centered thoughts have led to evil deeds, making him the most dangerous threat to ever appear in the universe.

## Appearance

Dr. Eggman is an obese, tall human with a small, bald head with blue eyes, a pinkish nose, and a bushy, mahogany-colored mustache.

During his early years, up until the Chaos incident, Eggman had a totally spherical torso with thin but proportionate arms and legs. He wore a red top with a short yellow cape, attached to his shoulders by a triangular collar, black pants with attached boots and a pair of large silver buttons on the front, white gloves, and mirrored pince-nez glasses. His nose was also bright red, and his mustache was neater, with only three tufts sticking out at each end.

Since the Chaos incident, Eggman has remained obese, but has become somewhat taller and burlier, with a torso roughly shaped like an egg, hence his nickname; long, almost disproportionately thin arms and legs; and a softer pinkish nose. His mustache retains its length, density, and mass, while also becoming much more unkempt. For attire, the doctor now wears his tinted glasses, as well as green-lensed goggles known as the "Egg Goggles" as headwear; and an elegant, red coat sporting two square metal buttons on both sides of the chest in gold. These buttons have white straps that run across the coat's sides to identical buttons on the back. The coat also has silver, zipper-like linings down the back, arms, and front, yellow cuffs, and two extensions on the front that have large silver buttons. In addition, Eggman wears white, cuffless gloves on his hands and a pair of black pants with matching boots seemingly attached to them bearing circular plates on both sides of the ankles and three-square ones riding up the shin. His eyes are barely seen but they can be seen behind his glasses in some cutscenes in *Sonic the Hedgehog* (2006) revealing them to be blue. Early on, Western Sonic media would depict his usual blue glasses as empty black eyes.

On special occasions, Eggman has worn different outfits:

* For the purpose of camouflage, Eggman wears a military suit that consists of a black helmet that covers most of his head, a pair of large, black glasses, and a jacket that looks almost identical to his normal one except that it is black instead of red.
* For the purpose of Extreme Gear racing, Eggman wears a bright red coat with a small white cape, two zippers on the sides and one at the center, and yellow cuffs; and a white T-shirt. While still retaining his gloves, glasses and pants, he also wears a white helmet with his goggles and a gray belt with a golden buckle on it.
* During the Tokyo Olympics, Eggman has worn a pair of black shorts, a white T-shirt, and red and white sneakers with gray soles; in addition to his standard pince-nez glasses and goggles.

During the Solaris incident, Eggman had a radically different appearance. In particular, he had yellow bolt-like buttons on his red coat where the buckles originally were, as well as a slightly raised collar obscuring his chin. His mustache, while still bushy, also looked more groomed, and he also, while still overweight, looked very lean by comparison to his usual designs. His nose was also colored the same as the rest of his skin.

## Relationships

Main article: Doctor Eggman/Relationships

## Trivia

* Eggman has blood type B.
	+ Rather fittingly, in Eastern Asian countries, people with blood type B are described as *jikochū* (自己中, **jikochū**? lit. "selfish") but creative and passionate.

* Sonic Heroes Eggman letter.pngA letter with Eggman's signature at the bottom, from *Sonic Heroes*.
* SU Eggman Poster.pngA poster with Eggman's signature, from the Xbox 360/PlayStation 3 version of *Sonic Unleashed*.
1/2
* In the opening of Team Sonic's story in *Sonic Heroes*, what appears to be Eggman's signature was partially seen on the letter he sent to the heroes. It consists of the word "Eggman" written in cursive.
	+ However, in the Xbox 360/PlayStation 3 version of *Sonic Unleashed*, a different signature was shown in one of Eggmanland's souvenirs. This one consists of the writing "DR. Eggman" and a drawing of the doctor's mustache and glasses.
* According to Orbot, Eggman has lost to Sonic at least 227,000 times by the time of *Team Sonic Racing*.
* Despite his general disdain towards nature, Eggman was said to have a vegetation garden somewhere onboard the Final Fortress.
* According to Takashi Iizuka, Eggman makes his eggs sunny-side up.
* According to Takashi Iizuka, *Sonic Forces* probably marks the only point where Eggman will be most successful in his goals.
* Eggman does not regret blowing up half of the moon in *Sonic Adventure 2*, nor does he care about whether or not his publicist got upset about it.
* According to a promotional ad for *Sonic Jump* (2012), Eggman can merely jump a single meter (3,28 ft.) in a minute, as opposed to Sonic's 342 meters (1122,04 ft.) in that same time.
* Apparently, Eggman does not enjoy being on teams.
* Eggman appears to love taking selfies, supposedly having around ten terabytes just of them in his computer.

 File:Eggman 1931.jpg
* Despite Eggman's age having been displayed as "Unknown" in most sources, the Japanese *Sonic Jam* guide refers to him as an "old man", which is currently defined by the United Nations to refer to persons that surpass the age of 60 or 65. More recently, the *Life in Sonic's World* artbook released in 2021, which contains descriptions of "Sonic PICT" artwork from Sonic Channel, speculates that the doctor might be old judging by his speech manner and mustache.Template:Better source needed
	+ In Japanese, Eggman also goes by the personal pronoun *washi* (わし, **washi**?), which is used in fiction to represent characters of old age.
	+ A piece of concept artwork of *Sonic the Hedgehog CD* indicates that the doctor was born in 1931, which would put him in his 60s if one assumes the franchise takes place in the 1990s, and in his early 90s in the present day.
	+ Mike Pollock, Eggman's English voice actor since 2005, stated on Twitter that the doctor was said to be in his 40s according to the specs he was given in 2009. However, he also elaborated that these were more likely to refer to the vocal age the producers wanted for the character.
* Eggman's favorite hot dog is the "Egg Dog" which was sold in Eggmanland in *Sonic Unleashed*. He also appears to like his "Poppin' Eggcorn", which he munches all the time.
* It is hard to pinpoint the exact moment where Eggman stopped referring to himself as "Robotnik". In various of the Classic games, the name "Eggman" can be seen at some points like in Wing Fortress Zone in *Sonic the Hedgehog 2*, and is used in some of his creations like the Giant Eggman Robo from *Sonic & Knuckles*. However, in the English version of *Sonic Adventure*, he asserts that his name is "Robotnik", but begins referring to himself as "Eggman" from *Sonic Adventure 2* onward. In *Sonic Generations*, Classic Eggman (the version of the character from before *Sonic Adventure*) says that "nobody calls me that [Robotnik] anymore", suggesting that he had adopted the nickname much earlier.
* While Eggman himself does not appear to know his birthday date, he seems to share his birthday with Sonic's, on June 23, the release date of the original *Sonic the Hedgehog* in the United States. This is an allusion to the fact that both characters made their first major appearance in that game.
	+ This was first strongly implied in the "Birthday on Windy Hill" event for *Sonic Runners*, and in the June 24, 2023 stream of *Sonic Station Live!*, where Sonic and Tails sing "happy birthday" to Eggman.
	+ A 2019 joke post made by the official Sonic the Hedgehog social media account suggested that Eggman is a taurus, putting his birthday between April 20 and May 20.
* While Eggman does not have a permanent residence, he does refer to the Final Fortress as "home sweet home" in *Team Sonic Racing*, implying he lived there during that game.
* In the Sonic Simulator in *Sonic Riders: Zero Gravity*, Eggman claimed that he could perform outstanding tricks similar to Sonic's own when he was younger, though the accuracy of this claim cannot be guaranteed.
* Eggman seems to run countless casinos that he himself has built. His influence over the casino industry is apparently so large that some people have reported only seeing poker chips with his face plastered on them.
	+ Regardless, for unspecified reasons, Eggman has been "unfairly" banned from casinos such as Casino Park.
* Eggman has been noted for his awful food. Various of Sonic's friends, including Chip, Professor Pickle, and Tails have declared their disgust over it, with the former even implying that the doctor's favorite food might be largely made of synthetic ingredients.
	+ Despite how repugnant Eggman's food appears to be, Amy has reported that he appears to be surprisingly good at baking cookies judging by his recipe for them, but only if one takes out the "evil influences" from it.
* It is speculated Eggman might secretly be very rich, judging by his ability to gather up enough resources to build massive warships like those in his Egg Fleet.
* Eggman has occasionally been depicted as somewhat of a rapper, examples including the background music of Metallic Madness in *Sonic the Hedgehog CD* and especially in its recreation in *Sonic Mania*, as well as in the 2023 edition of the *Sonic Central* presentations. In all three of these, in line with his narcissism, he has had a reoccurrent theme of boasting about his inventions like his Badniks and his mechs, as well as his evilness and his new plan to defeat Sonic and conquer the world.
* It has been hinted that Eggman has lawyers.
* According to Naoto Ohshima, Eggman is a Doctor of Engineering.
* In *Sonic Adventure*, the doctor has a Chao Garden on his Egg Carrier. Though the reason for this is unknown, it has been speculated that he might have an unexpected fondness for cute things.
* As depicted in *Sonic the Animation*, Eggman is a very messy man, with posters of himself and crossed out images of Sonic filling the walls in his lair, and piles of junk that even he himself frequently trips over being all over his workroom.
* When asked whether Eggman had parents, Naoto Ohshima replied "maybe".
* On 3 December 2012, a woman named Susan Eggman was elected a member of the California State Assembly. Additionally, in June 2014, a man named Michael Eggman was elected Congress Representative of Central Valley, California. Due to this, Dr. Eggman is currently the only character in the series who shares a name with a political figure.
* Accordingly, the yellow "cape" Eggman wore before *Sonic Adventure* is based on the uniform worn by sea cadets, specifically those in the United Kingdom.
* Not counting *Dr. Robotnik's Mean Bean Machine*, which features his *Adventures of Sonic the Hedgehog* counterpart, Eggman has only starred in one game: the *Sonic Cafe* title *Eggman no Kazuate Panic!*
	+ In early 2005, a poll was done in Sega's official website asking which character should get their own game. The contestants were Tails, Knuckles, Shadow, and Eggman himself. The names suggested for a hypothetical game starring the doctor were "*Dr. Eggman Strikes Again!*", "*Dr. Eggman and the Lost Emeralds*", "*Dr. Eggman: Robotnik's Revenge*", "*Dr. Eggman: Out of Control*", and "*Dr. Eggman: The World's Not Enough*". In the end, Eggman came in tied with Shadow, who would get his own game at the end of 2005.Template:Better source needed

 File:Dr-robotonic.jpg
* On rare occasions, Eggman's surname "Robotnik" has been misspelled "Robotonik" or similar in English localizations of the games, most likely due to an incorrect romanization of the Japanese *Robotonikku* (ロボトニック, **Robotonikku**?).
* Eggman is one of the first characters in the *Sonic the Hedgehog* series to swear, having used profanities on some occasions to talk to the playable characters in *SegaSonic the Hedgehog*.
* Eggman is the only character who has retained his English voice actor since 2005, whereas all of the other characters have had their English voice actor changed in 2010.
* In *Shadow the Hedgehog*, Dr. Eggman is the only ally of Shadow's that appears as a guide for both Dark and Hero missions.
* In Western artwork and gameplay in *Sonic the Hedgehog 2* and *Sonic 3 & Knuckles* the doctor is shown to have black eyes instead of his usual blue glasses. This is because these games were developed in the United States, where the character was depicted without his glasses and with said black eyes. In *Sonic Origins* and *Sonic Origins Plus*, he was given his blue glasses in these titles for consistency with the other games included. This was also probably the reason why the original *Sonic the Hedgehog* cartoons gave him black eyes.
	+ Its also believed that this was all most likely done to make him sinister looking. In the latter artworks he is also commonly seen making aggressive facial expressions, while the Japanese one is commonly seen making happy ones, including friendly demeanours, also indicating Western Sonic media thought Japan's version of the doctor looked a bit friendly for a villian.
	+ In the said Western artworks he also lacks gloves, however some comics like the Sonic the Hedgehog (promotional comic and the first issue of Sonic the Comic included him with his white gloves respectively.
	+ In *Sonic Mania Adventures* and *Sonic Battle*, when they are visible behind his glasses they have a cartoony look identical to his portrayal in *Sonic the Hedgehog: The Movie*.
* So far, he is the only one of the main characters to have the most alternate designs out of all the characters, such as in cartoons and comics, despite still being similar and representative to his games appearance for having long moustache and a bald head etc, those designs even still keep his attires signature colours such red, yellow, and black.
* He is the only human character to be fully playable in a mainline *Sonic* game. Although Maria, and Eggman Nega are playable too; Maria is controllable with a second player in *Shadow the Hedgehog*, and Eggman Nega is playable in two of the *Mario & Sonic* games.
* Owing to Eggman's more childish personality, he tends to do activities in a more childlike manner, which is best demonstrated in *Sonic Superstars: Trio of Trouble*, where his attempted drawing copy of a particular mural, or more specifically the Black Dragon within the mural was crudely done enough that it bore a closer resemblance to a winged cow.

## Gallery

Dr. Robotnik in **Sonic the Hedgehog CD**Dr. Robotnik in **Sonic the Hedgehog CD**Dr. Robotnik in **Sonic the Hedgehog 2**
## References

1. ↑ 1.0 1.1 Devra Newberger Speregen (2016). *Sonic: The Ultimate Character Guide*. Scholastic. p. 23. ISBN 978-1338033243.
2. ↑ **Sonic Team**, Blindlight (November 4, 2006). *Sonic the Hedgehog*. PlayStation 3. Sega. Cutscene: Eggman sends Sonic to the future (Sonic Episode).
3. ↑ Prima Development (June 20, 2001). "The Beginning". *Sonic Adventure 2: Prima's Official Strategy Guide*. Prima Games. p. 3. ISBN 978-0761536147.
4. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. PlayStation 3. Sega. Area/level: Souvenirs. "**Eggman Poster** - It's a poster signed by Eggman himself. Would anybody even buy one of these?"
5. ↑ Sumo Digital (May 21, 2019). *Team Sonic Racing*. PlayStation 4. Sega. "**Sonic**: Looks like you lose again, Eggman. What does that make, like a million times or something? / **Eggman**: I don't keep score. / **Orbot**: Oh! I do! It's exactly two-hundred and twenty-seven thou- / **Eggman**: Oh, ZIP IT, Orbot! Looks like I need to up my game."
6. ↑ Sumo Digital (May 21, 2019). *Team Sonic Racing*. PlayStation 4. Sega. Cutscene: Before 3-1. "**Cubot**: Awww, I wish the boss had let us race with him instead of letting those Eggpawns be on his team. / **Orbot**: Yes, but we have a list of duties to perform here while the boss is away. / **Cubot**: That's right. We need to maintain the power levels of the boss's vegetable garden and water the unstable energy core. / **Orbot**: I think you read the list backwards."
7. ↑ 7.0 7.1 7.2 Sonic Frontiers: 123 Rapid-Fire Questions With Takashi Iizuka. *YouTube*. Game Informer (July 12, 2022). Retrieved on July 13, 2022.
8. ↑ Sumo Digital (May 21, 2019). *Team Sonic Racing*. PlayStation 4. Sega. "**Eggman**: Wow! That almost makes me enjoy being on a team!"
9. ↑ Sonic Team (November 7, 2017). *Sonic Forces*. Nintendo Switch. Sega. Area/level: World Map. "**Tails**: Hold on a sec, while I access the data from this computer... [...] wow, he's got like ten terabytes of selfies... so where does he keep the--"
10. ↑  (in Japanese) *ソニックジャム　オフィシャルガイド*. SoftBank. October 2, 1997. p. 105. ISBN 978-4797303377. "勝利を信じるこりないオヤジ [Old man who doesn't believe in victory]"
11. ↑ Encyclopedia Sonnica on Tumblr. Tumblr (2022). Retrieved on October 25, 2022. “Despite being old-aged, he's still robust…. or perhaps I [Yui Karasuno] should say that I don't know how old Eggman is but going by his speech manner and splendid mustache, he seems old enough.”
12. ↑ Mike Pollock on Twitter. Twitter (October 2, 2022). Retrieved on October 2, 2022. “**Spooky AfterLife💙🎃**: How old do you guys think Eggman is??? / **Mike Pollock**: The casting specs in 2009 said 'Age 40’s,' so there's that.”
13. ↑ Mike Pollock on Twitter. Twitter (December 2, 2019). Retrieved on February 6, 2023. “**Mike Pollock**: The specs in the last casting brief I saw said 'Age: 40’s' but I'd imagine that's more to do with the sound they wanted rather than the age of the character, per se. / **Jordan Hobbis**: 40’s? I would have imagined Eggman to be in his late 30’s, at least / **Mike Pollock**: Like I said, it's more vocal age than physical age.”
14. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. PlayStation 3. Sega. Area/level: Edible items. "**Egg Dog** - Eggman's favorite chili dog. It's positively scrumptious!"
15. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. PlayStation 3. Sega. Area/level: Edible items. "**Poppin' Eggcorn** - Popcorn, for a light snack. Eggman munches on it all the time."
16. ↑ Sonic Team (September 9, 1999). *Sonic Adventure*. Dreamcast. Sega. Area/level: Mystic Ruins Station Area (Tails' story). "**Tails**: It's Eggman! / **Eggman**: Silence! I am Dr. Robotnik, the most cunning scientific genius in the world!"
17. ↑ Sonic Team (June 23, 2001). *Sonic Adventure 2*. Dreamcast. Sega. Area/level: Dark Story. "**Eggman**: My name is Dr. Eggman, the world's greatest scientist, and soon to be the world's greatest ruler!"
18. ↑ Sonic Team (November 4, 2011). *Sonic Generations*. PlayStation 3. Sega. Cutscene: The Final Battle! "**Classic Tails**: Dr. Robotnik! / **Classic Eggman**: Nobody calls me that anymore."
19. ↑ 19.0 19.1 ソニック・ザ・ヘッジホッグ【公式】. ソニックステーションLIVE！ソニックバースデー＆「SONIC CENTRAL」振り返り特番！【ゲスト：れじぇくん】(2023.6.24放送回) (Japanese). YouTube. Retrieved on June 28, 2023.
20. ↑ "Profile: Sonic". *Sonic the Hedgehog Super Interactive Annual 2014*. Pedigree Books. September 17, 2013. p. 14. ISBN 978-1908152077. "Sonic's birthday is June 23rd and he was born on Christmas Island."
21. ↑ Yuji Naka / 中　裕司 on Twitter (Japanese). *Twitter* (June 23, 2020). Archived from the original on June 23, 2020. Retrieved on January 27, 2021. “Happy birthday Sonic!! 今日でソニックも29周年ですね。 6月23日をソニックの誕生日って僕が決めたのですが、今思うと色々と気になります [Happy birthday Sonic!! Today is Sonic's 29th anniversary. I decided June 23 as Sonic's birthday, but now that I think about it, I'm curious about various things.]”
22. ↑ Sonic Team (February 25, 2015). *Sonic Runners*. iOS. Sega. Area/Level: Birthday on Windy Hill. "**Sonic**: Time to come clean, Eggman—why are you doing all this? / ****Eggman****: 'Why'?! Isn't it obvious? I've spent my life trying to make the world a better place! Discovering lost continents, building theme parks... I should be the one getting the big birthday party, not you!"
23. ↑ Sonic the Hedgehog on Twitter. Twitter (June 25, 2019). Retrieved on November 6, 2022. “**Taurus** - All you really want is to take over the world. Do it.”
24. ↑ Sumo Digital (May 21, 2019). *Team Sonic Racing*. PlayStation 4. Sega. Area/level: Thunder Deck. "**Eggman**: Home sweet home!"
25. ↑ Sonic Team, CRI Middleware (February 22, 2008). *Sonic Riders: Zero Gravity*. PlayStation 2. Sega. Area/level: Sonic Simulator (Mission 3). "**Eggman**: Not bad at all, but you should have seen what I could do when I was younger!"
26. ↑ Sega (March 31, 2023). *The Murder of Sonic the Hedgehog*. Steam. Sega. Area/level: Casino Car. "**Tails**: Dr. Eggman's built a lot of casinos to run around in, but I've never actually sat down to play any for fun. [...] That's Dr. Eggman's logo... I suppose he does deal with a lot of casinos. [...] / **Unnamed quokka**: Hm... Every poker chip I've personally seen has had Eggman's mug on it. So I'm not too surprised to see this here."
27. ↑ Sumo Digital (May 21, 2019). *Team Sonic Racing*. PlayStation 4. Sega. Area/level: Roulette Road. "**Eggman**: I've been unfairly banned from all these casinos."
28. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. Xbox 360. Sega. Area/level: Edible items. "**Chip** (after eating the Egg Candy): Gah! Bitter, bitter, bitter, bitteeeer!"
29. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. Xbox 360. Sega. Area/level: Edible items. "**Chip** (after eating the Egg Dog): Bleagh! Gross! This is supposed to be a chili dog?! Try rubber dog!"
30. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. Xbox 360. Sega. Area/level: Edible items. "**Chip** (after eating the Egg Puff): What the heck?! It's full of some weird-colored bitter gunk..."
31. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. Xbox 360. Sega. Area/level: Edible items. "**Chip** (after eating the Egg-squisite Lunch): This has kind of a weird smell to it. It smells like... motor oil?!"
32. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. Xbox 360. Sega. Area/level: Edible items. "**Chip** (after eating the Poppin' Eggcorn): Ugh!, tastes like sawdust!"
33. ↑ Sonic Team (December 9, 2008). *Sonic Unleashed*. Xbox 360. Sega. Cutscene: Same As Ever. "**Pickle**: How dare they call this culinary concoction food? Look here, do you see this sorry excuse for a sandwich? The bread should be no less than 3/4 of an inch thick. Upon it, one tablespoon of mayonnaise and a pinch of black pepper. The contents: FRESH cucumber sliced THINLY if you please! [...] Let's go. There's no time to lose. I'm half-starved after being fed nothing but those terrible sandwiches!"
34. ↑ Sonic Team (November 9, 2010). *Sonic Colors*. Wii. Sega. Cutscene: Movie No. 16: Aim to Please. "**Tails**: Great job Sonic. / **Sonic**: You know me. I aim to please. / **Tails**: Well, I'm TOTALLY pleased... and a little nauseous. I grabbed a bite at The Bucket O' Sushi. / **Sonic**: What's the verdict? / **Tails**: His [Eggman's] cruelty knows no bounds."
35. ↑ Rosenthal, Victoria; Flynn, Ian (October 17, 2023). "Desserts (Evil Cookies)". *Sonic the Hedgehog: The Official Cookbook*. p. 154. "**Eggman**: Revenge is sweet, but my cookies are sweeter. (They also say 'revenge is a dish best served cold,' but what kind of monster likes cold cookies?) These succulent, evil circular delights are a temptation no one can refuse! / **Amy**: Post-Edit note: I took the liberty of editing the recipe to take out all the evil influences. The base recipe is surprisingly great, though. Eggman knows how to bake! Who knew?"
36. ↑ Sonic Team (February 6, 2004). *Sonic Heroes*. PlayStation 2. Sega. Area/level: Egg Fleet (Team Chaotix). "**Vector**: Eggman must be really rich! Wonder if he'd hire us?"
37. ↑ Sonic the Hedgehog (June 23, 2023). Sonic Central - June 23rd, 2023. YouTube. Retrieved on June 23, 2023.
38. ↑ Sonic Team (November 16, 2010). *Sonic Colors*. Wii. Sega. Area/level: Asteroid Coaster. "**Eggman** (speaker): Please keep your hands and feet inside the car at all times, because there are tiny asteroids travelling at incredible speeds, hurtling through space. Keeping your hands and feet in the car won't prevent you from being hit, but our lawyers tell us we have to say it anyway."
39. ↑ Naoto Ohshima on Twitter. Twitter (April 17, 2019). Retrieved on June 30, 2022. “**Ashwin Rajani**: .@sonic\_hedgehog @NaotoOhshima Is Doctor Robotnik a Doctor of Medicine or a Doctor of Philosophy? / **Naoto Ohshima**: Doctor of engineering”
40. ↑  (in Japanese) *ソニックアドベンチャー オペレーションガイド*. SoftBank. January 1999. p. 158. ISBN 978-4757203006.
41. ↑ Naoto Ohshima (March 14, 2022). Naoto Ohshima on Twitter. Twitter. Retrieved on February 9, 2023.
42. ↑ Sega (2005). Sonic The Hedgehog Poll. Archived from the original on February 19, 2005. Retrieved on February 12, 2023.
43. ↑ KrACK💤 (February 8, 2023). KrACK💤 on Twitter. Twitter. Retrieved on February 12, 2023.
44. ↑ Sega AM2 (June 1996). *Sonic Championship*. Arcade. Sega. Cutscene: Intro. "Revenge of Dr. Robotonic"
45. ↑ Sega. ソニックチャンネル/キャラクター/ソニックとは？/年表 １９９３年. Sonic Channel. Retrieved on January 14, 2023. “『Dr.ROBOTONIK's MeanBeanMachine』[*sic*]発売 [Release of *Dr.ROBOTONIK's MeanBeanMachine*]”
46. ↑ Sega Sonic Arcade in-game text. South Island Stories. Retrieved on December 7, 2015.