Neptune

is a -themed monster who killed Jin's father.
==Character History==
Neptune is a representative of G.O.D. who was assigned to invite Keitaro Jin to join the organization. As Jin rejects his invitation, Neptune acts to kill him. Although he has an advantage in the battle with X Rider for a while, his body exploded after receiving X Kick, and the remaining head tried to take the X Rider with him with a neck bomb, but he failed and was the only one who died. 
Later, Neptune returns as . Setting his sights on the upcoming "Kamen Rider" talk show, Neptune secretly kidnaps the host and disguises himself. 
Once the show starts, a disguised Neptune attempts to slander the five Kamen Riders with ridiculous lies and misinformation. Angered by Neptune's actions, Tachibana and the audience retaliate, driving him away from the talk spot. 
Soon afterwards, Tachibana decides to personally tell the audience of each Kamen Rider's heroic acts. Annoyed by this, Neptune argues with Tachibana until Keisuke and the freed host intervene, forcing Neptune to shed his disguise. Joined by Medusa and Chimera, Neptune ambush Keisuke, with Shiro Kazami/Kamen Rider V3 suddenly appearing in front of them.
Proving no match for the two Riders, Neptune and his forces are defeated, though not before providing information for G.O.D. about their enemies. 
==Personality==
Like many of his allies, Neptune is a ruthless thug that enjoys committing acts of cruelty. While disguised as a storyteller, Neptune openly states his contempt towards the Kamen Riders, belittling them with crude lies as well.
==Other appearances==
===Five Riders vs. Kingdark===
Appeared as a member of the Revived Monster Army. He assists Franken Bat in Operation Tokyo Karakara. 
===Adventure King manga===
In Kamen Rider X Birth! chapter, he fights as the first opponent of Kamen Rider X as in the TV series. 
===SD Hero Total Battle Defeat! Evil Army===
Appeared as a Zako Character in Stage 1 "Shocker Base" and Stage 5 "Shocker Base".
==Monster Information==
*Height: 178 cm. (2016). "Kamen Rider Showa" Vol.4 Kamen Rider X. p. 19, "G.O.D.'s Secret Mechanical Monsters". ISBN 978-4-06-353572-3.
*Weight: 83 kg
An aquatic cyborg, Neptune could function both in sea and on land. He possessed the ability to spew foam-like bubbles from his mouth. (1986). "15th Anniversary TV Magazine Special Edition Kamen Rider Kaijin Dai Zenshu". pp. 78-79, "G.O.D. (Episode 1-Episode 4)". ISBN 4-06-178402-1. that would cause instant death upon contact with humans, reducing them to skeletons. Befitting his motif, Neptune wielded a trident as his weapon. He is also equipped with a to explode his own head as final weapon, and the ability to disguise as human.
==Human Forms==
Neptune human.jpg|Neptune's first disguise.
Neptune human 2.jpg|Neptune as Chizuru Tanabe.
==Behind the Scenes==
===Portrayal===
Neptune was voiced by (Episode 1, credited as ) and (Episode 27, credited as ). As human form, he was portrayed by unknown actor in Episode 1 and (Episode 27).
His suit actor is Fujinsha. (1999). "Ohno Kenyukai Biography The Masters of Hero Action". ISBN 4-938733-69-2.. (2004). "KODANSHA Official File Magazine Kamen Rider Vol.9 Kamen Rider Super-1". pp. 27-29, Masaki Wachi "Special Feature: Ohno Kenyukai Rider Action Shadow Protagonists". ISBN 4-06-367090-2. and .
===Conception===
 In the rough sketch, there were no fins on the left arm and crown.. (2011). "Kamen Rider Super Dictionary". p. 582. ISBN 978-4-575-30333-9.
==Notes==
*Some sources describe his weapon as a harpoonEichi Publishing. (2003). "The Complete Works of Monsters (First Volume) Toei Edition". p. 106. ISBN 4-7542-2016-1. or a three-pronged spear.
*Neptune is one of the monster who appears in the ending video. (1986). "15th Anniversary TV Magazine Special Edition Kamen Rider Kaijin Dai Zenshu". pp. 182-185, "List of Kamen Rider Monster Re-appearance Works". ISBN 4-06-178402-1..
*Footage of Neptune's defeat by Kamen Rider X appeared in the TV special Birth of the 10th! Kamen Riders All Together!! (1984), in a recap of the ten Kamen Riders.
==Appearances==
* Kamen Rider X
**Episode 1: X-X-X-Rider is Born!!
**Episode 27: Special Edition, Full Force of Five Riders!!
**Five Riders vs. Kingdark
* Birth of the 10th! Kamen Riders All Together!! 
Category:G.O.D. Kaijin
Category:First Villain
Category:Fish Monsters
Category:Human Monsters
Category:X Characters
Category:G.O.D.