# Sgt. Frog season 4

The fourth season of the Sgt. Frog anime series consists of the fifty-one episodes after episode one-hundred-and-fifty-four from the series, which first aired in Japan from April 7, 2007, to March 29, 2008, on TV Tokyo. Season 4 uses 5 songs: 2 Openings and 3 Endings. "Kaettekita Kero! tto March" (帰ってきたケロッ!とマーチ, Kaettekita Kero! tto Māchi, "Return of the Kero! and March") by Ichirō Zaitsu & Yuko Ogura is used as the opening from episode 155 to 183. "Fundari Kettari" (フンダリーケッタリー, Fundarī Kettarī) by Dylan & Catherine is used as the opening from episode 184 to 205. "Kurutto, Mawatte, Ikkaiten" (くるっと•まわって•いっかいてん, "Spinning, Turning, Once Around") by Kigurumi is used as the ending from episode 155 to 168. "Niko Niko Champ" (ニコニコチャンプ, Niko Niko Chanpu, "Smiling Champ") by Non Style is used as the ending from episode 169 to 192. "Kero Neko no Tango" (ケロ猫のタンゴ, "Kero Cat's Tango") by Osamu Minagawa & Hibari Children Chorus is used as the ending from episode 193 to 205.

## Episode list

| No. | Title | Original release date |
| 155 | "Keroro Platoon, Cut a Good Tune!/Keroro Platoon, Big Resonance!" Transliteration: "Keroro Shōtai zekkōchō! de Arimasu/Keroro Shōtai Daikyōmei! de Arimasu" (Japanese: ケロロ小隊　絶好調！　であります/ケロロ小隊　大共鳴！　であります) | April 7, 2007 (2007-4-7) |
| 156 | "Keroro, Unite! Keroro Robo/Keroro Invasion! Cherry Blossom Frontline Extreme!" Transliteration: "Keroro Gattai! Keroro Robo de Arimasu/Keroro Shinryaku! Sakura Saizensen! de Arimasu" (Japanese: ケロロ　合体！ケロロロボ　であります/ケロロ　侵略！桜最前線！　であります) | April 14, 2007 (2007-4-14) |
| 157 | "Leave it to Chief Medic Pururu!/Natsumi, Today's Fortune" Transliteration: "Pururu Kangochō ni Omakase!/Natsumi Kyō no Uranai de Arimasu" (Japanese: プルル　看護長におまかせ！　であります/夏美　今日の占い　であります) | April 21, 2007 (2007-4-21) |
| 158 | "Keroro, Past Victories/Giroro, Exclude These Memories" Transliteration: "Keroro Kako no Eikō de Arimasu/Giroro Kindan no Kioku de Arimasu" (Japanese: ケロロ　過去の栄光　であります/ギロロ　禁断の記憶　であります) | April 28, 2007 (2007-4-28) |
| The Keroro Platoon create a video showing off their various "successes" in trying to take over Pekapon. Keroro, Tamama, Dororo, and Pururu travel inside of Giroro's memories. Things take a turn for the worse, however, when Kururu starts inserting himself into each memory to mess with Giroro. |||
| 159 | "Keroro, Climax! Card Battle/Keroro, the Targeted Platoon" Transliteration: "Keroro Hakunetsu! Kādo Batoru/Keroro Nerawareta Shōtai de Arimasu" (Japanese: ケロロ　白熱！カードバトル　であります/ケロロ　狙われた小隊　であります) | May 5, 2007 (2007-5-5) |
| 160 | "Momoka, the Greatest Mother's Day" Transliteration: "Momoka Saikyō no Haha no Hi de Arimasu" (Japanese: 桃華　最強の母の日　であります) | May 12, 2007 (2007-5-12) |
| 161 | "Putata and Mekeke, Overzealous Killers" Transliteration: "Putata & Mekeke Hissatsu Oshigotojin de Arimasu" (Japanese: プタタ＆メケケ　必殺お仕事人　であります) | May 19, 2007 (2007-5-19) |
| A Keronian known as Putata wreaks havoc with his ability to make paintings come to life. |||
| 162 | "Chibi Kero, That Time, Joriri" Transliteration: "Chibi Kero Ano Koro Joriri de Arimasu" (Japanese: ちびケロ　あのころジョリリ　であります) | May 26, 2007 (2007-5-26) |
| 163 | "Natsumi, Goodbye Saburo/Fuyuki and Alisa, The Rain Monster" Transliteration: "Natsumi Sayonara Saburō de Arimasu/Fuyuki & Arisa Ame no Kaibutsu de Arimasu" (Japanese: 夏美　さよならサブロー　であります/冬樹＆アリサ　雨の怪物　であります) | June 2, 2007 (2007-6-2) |
| 164 | "Keroro, Nyororo Extinction?/Lavie, Goings of an Honorable Bride!" Transliteration: "Keroro Nyororo Metsubō? de Arimasu/Rabī Oyome ni Ikimasu! de Arimasu" (Japanese: ケロロ　ニョロロ滅亡？　であります/ラビー　お嫁に行きます！　であります) | June 9, 2007 (2007-6-9) |
| 165 | "Kululu, Temporary Leader/Koyuki, Training as Usual" Transliteration: "Kururu Rinji Taichō de Arimasu/Koyuki Futsū Mōtokkun de Arimasu" (Japanese: クルル　臨時隊長　であります/小雪　普通猛特訓　であります) | June 16, 2007 (2007-6-16) |
| 166 | "Keroro, Crush! Wettol Robo/Keroro, Assault! Wettol Human" Transliteration: "Keroro Kudake! Wettoru Robo de Arimasu/Keroro Totsugeki! Wettoru Hyūman de Arimasu" (Japanese: ケロロくだけ！ウエットルロボであります/ケロロ突撃！ウエットルヒューマンであります) | June 23, 2007 (2007-6-23) |
| 167 | "556, Cup Ramen Recipe/Keroro, Capture! Crossword" Transliteration: "Kogorō Kappumen no Tsukurikata de Arimasu/Keroro Kōryaku! Kurosuwādo de Arimasu" (Japanese: ５５６　カップメンの作り方　であります/ケロロ　攻略！クロスワード　であります) | June 30, 2007 (2007-6-30) |
| 168 | "Keroro, Big Plan for Period Restriction/Momoka, My Limited Tanabata" Transliteration: "Keroro Kikan Gentei Daishinryaku de Arimasu/Momoka Tanabata Gentei no Watashi de Arimasu" (Japanese: ケロロ　期間限定大侵略　であります/桃華　七夕限定の私　であります) | July 7, 2007 (2007-7-7) |
| 169 | "Urere, King of the Trains/Giroro, Beautiful Girl and the Liquid Keronian" Transliteration: "Urere Densha no Ōsama de Arimasu/Giroro Bishōjo to Ekitai Keronjin de Arimasu" (Japanese: ウレレ　電車の王様　であります/ギロロ　美少女と液体ケロン人　であります) | July 14, 2007 (2007-7-14) |
| Urere returns, but this time, he tries invading Pekopon with a train. Giroro is turned into liquid by the liquid Keronian, Giruru. |||
| 170 | "Fuyuki and Keroro, Inaccurate! Seven Wonders/Pururu and Chiruyo, Secret Friends" Transliteration: "Fuyuki & Keroro Abake! Nana Fushigi de Arimasu/Pururu & Chiruyo Himitsu no Tomodachi de Arimasu" (Japanese: 冬樹＆ケロロ　あばけ！七不思議　であります/プルル＆散世　秘密の友達　であります) | July 21, 2007 (2007-7-21) |
| 171 | "Tamama, To Rebel Is Regrettable/Kululu, When Was He a House Sitter?" Transliteration: "Tamama Riyūnaki Hankō de Arimasu/Kururu to Orusuban? de Arimasu" (Japanese: タママ　理由なき反抗　であります/クルル　と　お留守番？　であります) | July 28, 2007 (2007-7-28) |
| 172 | "Alisa and Fuyuki, UMA Versus Dangal!" Transliteration: "Arisa F fuyuki UMA tai Dangaru! de Arimasu" (Japanese: アリサ＆冬樹　ＵＭＡ対ダンガル！　であります) | August 4, 2007 (2007-8-4) |
| 173 | "Keroro, Yamato, and Kappa" Transliteration: "Keroro Yamato to Kapū de Arinsu" (Japanese: ケロロ　ヤマトとカプー　でありんす) | August 11, 2007 (2007-8-11) |
| 174 | "Keroro, Butchered Hair, and the Afro Ondo?/Dororo, Mysterious Mountain" Transliteration: "Keroro Buccha Ke, Afuro de ondo? de Arimasu/Dororo Fushigi no Yama de Arimasu" (Japanese: ケロロ　ブッチャ毛、アフロで音頭？　であります/ドロロ　不思議の山　であります) | August 18, 2007 (2007-8-18) |
| 175 | "Keroro, Dive! Vinyl Pool/Fuyuki and Natsumi, A New Day Is Here" Transliteration: "Keroro Tobikome! Binīru Pūru de Arimasu/Fuyuki & Natsumi Atarashii Asa ga Kita de Arimasu" (Japanese: ケロロ　飛び込め！ビニールプール　であります/冬樹＆夏美　新しい朝がきた　であります) | August 25, 2007 (2007-8-25) |
| 176 | "Chibi Kero, Goodbye Summer Vacation!" Transliteration: "Chibi Kero Saraba Natsuyasumi! de Arimasu" (Japanese: ちびケロ　さらば夏休み！　であります) | September 1, 2007 (2007-9-1) |
| 177 | "Dokuku, Gas Keronian Number One/Keroro, Pekopon's Number One Gunpla Boy" Transliteration: "Dokuku Gasu Keronjin Daiichigō de Arimasu/Keroro Pekopon Ichi no Ganpura Otoko de Arimasu" (Japanese: ドクク　ガスケロン人第１号　であります/ケロロ　ペコポン一のガンプラ男　であります) | September 8, 2007 (2007-9-8) |
| The next member of the Shurara Corps, Dokuku, possesses Tamama and tries to use him to release Giruru from captivity. Keroro aspires to become the president of the company that makes his favorite Gunpla models. |||
| 178 | "Momoka and the Ghost, The Hinata Family's Phantom" Transliteration: "Momoka Gōsuto Hinataka no Maboroshi de Arimasu" (Japanese: 桃華　ゴースト　日向家の幻　であります) | September 15, 2007 (2007-9-15) |
| 179 | "Keroro, Running An Election!/Natsumi and Giroro, The Two Who Can't Return" Transliteration: "Keroro Shutsuba suru! de Arimasu/Natsumi & Giroro Kaerenai Futari de Arimasu" (Japanese: ケロロ　出馬する！　であります/夏美＆ギロロ　帰れない二人　であります) | September 22, 2007 (2007-9-22) |
| 180 | "Keroro, War is a Huge Hustle" Transliteration: "Keroro Sōdatsu Daisensō de Arimasu" (Japanese: ケロロ　争奪大戦争　であります) | September 29, 2007 (2007-9-29) |
| 181 | "Mushishi, Search for the Insects!/Momoka, Three-Legged Race!" Transliteration: "Mushishi Mushi no Idokoro o Sagase! de Arimasu/Momoka Sōdatsu! Nininsanyaku de Arimasu" (Japanese: ムシシ　虫の居所を探せ！　であります/桃華　争奪！二人三脚　であります) | October 6, 2007 (2007-10-6) |
| 182 | "Keroro, Buried Treasure Special/Tamama versus Tamama" Transliteration: "Keroro Maizōkin Supesharu de Arimasu/Tamama tai Tamama de Arimasu" (Japanese: ケロロ　埋蔵金スペシャル　であります/タママ対タママ　であります) | October 13, 2007 (2007-10-13) |
| 183 | "Garuru, Repeated Bother, Vacation" Transliteration: "Garuru Hata Meiwaku na Bakēshon de Arimasu" (Japanese: ガルル　はた迷惑なバケーション　であります) | October 20, 2007 (2007-10-20) |
| 184 | "Fuyuki, Burning Occult Article Ambition/Natsumi, Romeo and Juliet?" Transliteration: "Fuyuki Moeagare Okaruto Bunkasai de Arimasu/Natsumi Romio to Jurietto? de Arimasu" (Japanese: 冬樹　燃え上がれオカルト文化祭　であります/夏美　ロミオとジュリエット？　であります) | October 27, 2007 (2007-10-27) |
| 185 | "Robobo, Big Mechanized Operation/Tamama, It's a Notebook" Transliteration: "Robobo Kikaika Daisakusen de Arimasu/Tamama Nōto desū de Arimasu" (Japanese: ロボボ　機械化大作戦　であります/タママ　ノートですぅ　であります) | November 3, 2007 (2007-11-3) |
| Another member of the Shurara Corps, Robobo, arrives, and starts turning everyone into living appliances. Tamama finds a notebook that allows him to alter reality. But he gets more than he bargained for when he tries to use it on Momoka. |||
| 186 | "Arisa vs. the Ghost, Aggression is the Lack of Progress" Transliteration: "Arisa tai Yōkai Shinryaku ga Susumanai de Arimasu" (Japanese: アリサVS妖怪　侵略が進まない　であります) | November 10, 2007 (2007-11-10) |
| 187 | "Keroro, Thanksgiving's Working Ways/Keroro, Fight! WakiRanger" Transliteration: "Keroro Kinrō o Kansha seyo de Arimasu/Keroro Tatakae! Wakirenjā de Arimasu" (Japanese: ケロロ　勤労を感謝せよ　であります/ケロロ　戦え！ワキレンジャー　であります) | November 17, 2007 (2007-11-17) |
| Keroro runs away when the others reveal that they have no reason to be thankful for him. He runs into Joriri, who teaches him how to live a carefree lifestyle like him. The platoon are pestered by a Sentai-esque group of invaders known as the MinoRangers. |||
| 188 | "Nuii, Don't Ever Leave Me!" Transliteration: "Nuii Boku o Sutenai de! de Arimasu" (Japanese: ヌイイ　ボクを捨てないで！　であります) | November 24, 2007 (2007-11-24) |
| 189 | "Dororo, The Assassin From the Past" Transliteration: "Dororo Kako kara no Shikaku de Arimasu" (Japanese: ドロロ　過去からの刺客　であります) | December 1, 2007 (2007-12-1) |
| 190 | "Giroro, Target! The Present!/Keroro, The Big Birthday Party!" Transliteration: "Giroro Mokuhyō! Purezento! de Arimasu/Keroro Tanjōbi Dai Pātī! de Arimasu" (Japanese: ギロロ　目標！プレゼント！　であります/ケロロ　誕生日大パーティー！　であります) | December 8, 2007 (2007-12-8) |
| 191 | "Keroro, He and Lullaby Legend/Keroro, Plastic Model King, Very Big Charge!" Transliteration: "Keroro Aitsu to Rarabai Densetsu de Arimasu/Keroro Puramo Ō Daikessen! de Arimasu" (Japanese: ケロロ　あいつとララバイ伝説　であります/ケロロ　プラモ王大決戦！　であります) | December 15, 2007 (2007-12-15) |
| 192 | "Keroro, Prevent Christmas!/Keroro Platoon, A Cake Is a Man's Battlefield!" Transliteration: "Keroro Kurisumasu o Bōshi seyo! de Arimasu/Keroro Shōtai Kēki wa Otoko no Senjō da! de Arimasu" (Japanese: ケロロ　クリスマスを防止せよ！　であります/ケロロ小隊　ケーキは男の戦場だ！　であります) | December 22, 2007 (2007-12-22) |
| When he doesn't get the Gunpla models he wanted for Christmas, Keroro decides to ruin the holiday for everyone. But he soon learns that Santa Claus is not somebody to be messed with, especially when he turns out to be someone rather close to him. Everyone fights over who gets to eat the Christmas cake. |||
| 193 | "Keroro, Hatsumōde Without Humility/Keroro, Sechira versus Zonira" Transliteration: "Keroro Jingi naki Hatsumōde de Arimasu/Keroro Sechira tai Zonira de Arimasu" (Japanese: ケロロ　仁義なき初詣　であります/ケロロ　セチラ対ゾニラ　であります) | January 5, 2008 (2008-1-5) |
| 194 | "Toilet, Now, We Strike!/Kululu and a Puppy" Transliteration: "Toire Ima, tachiagaru Toki! de Arimasu/Kururu to Koinu de Arimasu" (Japanese: トイレ　今、立上がるとき！　であります/クルルと子犬　であります) | January 12, 2008 (2008-1-12) |
| 195 | "Natsumi, I Said "I Want to Ski, Too"!/Keroro, Hot Spring, Tiring Tennis Match!" Transliteration: "Natsumi Watashi mo Sukī ni Tsuretette! de Arimasu/Keroro Onsen ttsūtara Takkyū da! de Arimasu" (Japanese: 夏美　私もスキーに連れてって！　であります/ケロロ　温泉っつうたら卓球だ！　であります) | January 19, 2008 (2008-1-19) |
| 196 | "Keroro Special - Returned! Gero Gero 30 Minutes, 13 Stories" Transliteration: "Kaettekita Gerogero Sanjū Bun de Arimasu" (Japanese: 帰ってきたゲロゲロ30分　であります) | January 26, 2008 (2008-1-26) |
| 197 | "Zeroro, Multiplying?/Keroro, I Want to Dig Holes!" Transliteration: "Zeroro Fuesugi? de Arimasu/Keroro Ana ga Attara Horitai! de Arimasu" (Japanese: ゼロロ　増えすぎ？　であります/ケロロ　穴があったら掘りたい！　であります) | February 2, 2008 (2008-2-2) |
| In an adventure from the platoon's childhood days, Dororo (then known as Zeroro) gets himself cloned numerous times. Keroro has been making large holes throughout the Hinata household. This is revealed to be the result of a space drill that appears on his forehead, which he then starts spreading to the others. |||
| 198 | "Chibi Kero, Little-Little Big Adventure!/Natsumi and Momoka, Obligation Chocolate Excluded!" Transliteration: "Chibi Kero Chibichibi Daibōken! de Arimasu/Natsumi & Momoka Giri Choko Kinshi! de Arimasu" (Japanese: ちびケロ　チビチビ大冒険！　であります/夏美＆桃華　義理チョコ禁止！　であります) | February 9, 2008 (2008-2-9) |
| The Chibi Keroro Platoon are shrunk to the size of ants after eating an experimental candy that Kururu made. It's Valentine's Day, and Kururu gets himself in trouble when he uses a device to spy on everyone. |||
| 199 | "Kululu, Kululun Idol Legend/Keroro, Resetting My Mind!" Transliteration: "Kururu Kururun Aidoru Densetsu de Arimasu/Keroro Shoshin ni Kaeru! de Arimasu" (Japanese: クルル　クルルンアイドル伝説　であります/ケロロ　初心に帰る！　であります) | February 16, 2008 (2008-2-16) |
| Kururu becomes extremely popular as a singing idol. Keroro decides to take the platoon back to their roots and start committing more horrific crimes. |||
| 200 | "Keroro, Uru Has Come!" Transliteration: "Keroro Urū ga Kuru! de Arimasu" (Japanese: ケロロ　ウルーが来る！　であります) | February 23, 2008 (2008-2-23) |
| Keroro learns about the concept of leap years, and is terrified, because this means that an evil alien named Uru will come and destroy Pekopon. |||
| 201 | "Giroro, the Third of March is Ear Day?/Keroro, It's Not A Woman's Fight" Transliteration: "Giroro Sangetsu Mikka wa Mimi no Hi? de Arimasu/Keroro Ja nakute Onna no Tatakai de Arimasu" (Japanese: ギロロ　３月３日は耳の日？　であります/ケロロ　じゃなくて女の戦い　であります) | March 1, 2008 (2008-3-1) |
| Keroro's latest plan involves making everyone in Pekopon clean each other's ears. The girls fight over who gets to control a mystical orb known as the Toramon Ball. |||
| 202 | "Keroro, Attack! The Last Worker" Transliteration: "Keroro Gekitō! Saigo no Oshigotojin de Arimasu" (Japanese: ケロロ　激闘！最後のお仕事人　であります) | March 8, 2008 (2008-3-8) |
| After defeating Yukiki and Kagege, the last two members of the Shurara Corps, the platoon come face to face with Shurara himself. |||
| 203 | "Keroro, Shurara, Final Brawl!" Transliteration: "Keroro Shurara Saishū Kessen! de Arimasu" (Japanese: ケロロ　シュララ最終決戦！　であります) | March 15, 2008 (2008-3-15) |
| The final battle with Shurara takes place, and Keroro learns who his formidable nemesis really is. |||
| 204 | "Robo Kogoro/Keroro and Natsumi, Shelter From The Rain" Transliteration: "Robo Kogorō de Arimasu/Keroro & Natsumi Amayadori de Arimasu" (Japanese: ロボ　５５６　であります/ケロロ＆夏美　雨宿り　であります) | March 22, 2008 (2008-3-22) |
| Kogoro is turned into a robot. Keroro and Natsumi are stuck outside during a rainstorm. |||
| 205 | "Keroro and Fuyuki, Another World" Transliteration: "Keroro & Fuyuki Mō Hitotsu no Sekai de Arimasu" (Japanese: ケロロ＆冬樹　もうひとつの世界　であります) | March 29, 2008 (2008-3-29) |
| Keroro takes an underground train and ends up in an alternate reality where he never met Fuyuki. |||