Battle1: Who is the Strongest in History!?

Battle1: Who is the Strongest in History!? (史上最強は誰だ！？) is the first episode of the 4 Week Continuous Special Super Sentai Strongest Battle!!. It features the first appearances of Rita, Gaisorg, Ryusoul Green and Ryusoul Black.

Synopsis
A mysterious armored warrior known as Gaisorg stands before the Gokaigers! The Gokaigers are overwhelmed by Gaisorg's power, but just then, a golden plate lands before Marvelous after he gets knocked out of his transformation!

Space changes and he finds himself with a mysterious girl named Rita and Keiichiro Asaka who was working overtime at the GSPO. Rita declares that anyone who wins the "Super Sentai Ultimate Battle" will get any wish they so desire! Keiichiro is transported to Planet Nemesis, where several Sentai heroes are gathered there as well, including Yamato Kazakiri, Captain Marvelous, Kagura, Takaharu Igasaki, and Stinger!

Rita divides everyone into 32 teams of 5 members each, reiterating that whichever dream team wins will get their wish granted! The various dream teams aim for the championship, but Gaisorg, who just seeks to fight strong warriors, reappears once again and causes great distress for the various Sentai teams! How will the Super Sentai Strongest Battle go?!

Plot
The Gokaigers are attacked and defeated by Gaisorg, a mysterious warrior seeking out the strongest among the Super Sentai, who takes his leave while a golden ticket appears in Captain Marvelous' hand. At the GSPO headquarters, Keiichiro Asaka also receives a ticket and is contacted by Rita, a girl who is summoning every Super Sentai hero for a tournament at planet Nemesis, promising that the winner will have one wish granted. The summoned Sentai are divided into groups of five, with Marvelous placed into the "Oddball Team", along the Zyuohgers' Yamato Kazakiri, Takaharu Igasaki from the Ninningers, Stinger from the Kyurangers, and Kagura from the ToQgers. During the first round, Yamato faces off against Keiichiro until he convinces a truce upon hearing the GSPO officer's wish for a peaceful world. Meanwhile, another team who passed the first round is suddenly attacked by Gaisorg, and Marvelous reveals that he's just participating in the tournament to fight him again. During the second round, Takaharu and Stinger easily defeat the Boukengers' Eiji Takaoka and Sōsuke Esumi from the Go-Ongers during their argument before being attacked by Gaisorg, whom Marvelous pursues. Meanwhile, also possessing tickets, Ryusoul Green and Ryusoul Black explore a cave together.

Cast

 * Yamato Kazakiri (風切 大和): Masaki Nakao (中尾 暢樹)
 * Captain Marvelous (キャプテン・マーベラス): Ryota Ozawa (小澤 亮太)
 * Takaharu Igasaki (伊賀崎 天晴): Shunsuke Nishikawa (西川 俊介)
 * Stinger (スティンガー): Yōsuke Kishi (岸 洋佑)
 * Kagura Izumi (泉 神楽): Ai Moritaka (森高 愛)
 * Rita (リタ): Nana Asakawa (浅川 梨奈)
 * Gaisorg (ガイソーグ)/Narrator: Tomokazu Seki (関 智一)
 * Gokai Yellow (ゴーカイイエロー): Mao Ichimichi (市道 真央)
 * Ryusoul Green (リュウソウグリーン): Yuito Obara (小原唯和)
 * Ryusoul Black (リュウソウブラック): Tatsuya Kishida (岸田タツヤ)

Guest Cast

 * Keiichiro Asaka (朝加圭一郎): Kousei Yuuki (結木滉星)
 * Eiji Takaoka (高丘 映士): Masayuki Deai (出合 正幸)
 * Sosuke Esumi (江角 走輔): Yasuhisa Furuhara (古原 靖久)
 * Doggie Kruger (ドギー・クルーガー): Tetsu Inada (稲田 徹)
 * Announcer: Shinichiro Ohta (太田 真一郎)
 * Legendary Heroes (Voices): Shunsuke Kanie (蟹江俊介), Yukiko Motoyoshi (元吉有希子), Erika Sakata (坂田 恵理歌), Takumu Miyazono (宮園 拓夢)

Uncredited

 * Gokai Blue (ゴーカイブルー): Yuki Yamada (山田 裕貴)
 * Gokai Green (ゴーカイグリーン): Kazuki Shimizu (清水 一希)
 * Gokai Pink (ゴーカイピンク): Yui Koike (小池 唯)
 * Gokai Silver (ゴーカイシルバー): Junya Ikeda (池田 純矢)

Suit Actors

 * Zyuoh Eagle: Ryuta Hara (原 隆太)
 * Gokai Red: Kohei Matsuoka (松岡 航平)
 * Sasori Orange: Daiki Suzuki (鈴木 大樹)
 * AkaNinger: Shinya Shimokawa (下川 真矢)
 * ToQ 5gou: Kana Iwasaki (岩崎 香奈)
 * Gaisorg: Riichi Seike (清家 利一)
 * Patren 1gou: Masashi Takada (高田 将司)
 * GaoRed:
 * Bouken Silver:
 * Go-On Red:
 * Gokai Silver:
 * Gokai Pink:
 * Gokai Green:
 * Gokai Blue:
 * Doggie Kruger:
 * Ryusoul Green: Masato Tsutamune (蔦宗 正人)
 * Ryusoul Black: Yasuhiro Takeuchi (竹内 康博)

Souls

 * Go-On Red - N/A

Secret Disks

 * Shinken Red - Kyoutsuu (Rekka Daizantou), Shishi (Rekka Daizantou)

Gokai Changes

 * Gokai Changes in Battle1: Who is the Strongest in History!?:
 * Gokai Red - N/A
 * Gokai Blue - N/A
 * Gokai Green - N/A
 * Gokai Pink - N/A
 * Gokai Silver - N/A

Transfer Changes

 * ToQ 5gou - N/A

Nin Shuriken

 * AkaNinger - N/A

Zyuohger Form Changes

 * Zyuoh Eagle - N/A

Kyutama

 * Sasori Orange - N/A

Trigger Machines

 * Patren 1gou - N/A

RyuSouls

 * Ryusoul Green - N/A
 * Ryusoul Black - Tsuyo