|This article is about a/an episode in Kishiryu Sentai Ryusoulger.|
|WARNING: This episode contains scenes of blood. Viewer discretion is advised!|
Ep. 15: King of the Deep Sea (深海の王 Shinkai no ō) is the fifteenth episode of Kishiryu Sentai Ryusoulger. It features the full debut of Kishiryu MosaRex and the first appearance of Canalo's sister Oto.
Canalo's little sister Oto suddenly appears on the surface after hearing that Canalo is searching for a bride on land. Canalo tries to return her to the sea, as he is concerned with the fact that she has never been on land before. Canalo and Koh suddenly rush to the city after a Minosaur starts to attack. However, the Minosaur's powers cause the Ryusoulgers to separate amongst themselves. Just then, Kureon suddenly appears before Red and Gold and takes Oto as a hostage. Kureon demands that if they want her set free then Canalo must attack the Ryusoulgers.
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- Koh (コウ Kō): Hayate Ichinose (一ノ瀬 颯 Ichinose Hayate)
- Melt (メルト Meruto): Keito Tsuna (綱 啓永 Tsuna Keito)
- Asuna (アスナ): Ichika Osaki (尾碕 真花 Osaki Ichika)
- Towa (トワ): Yuito Obara (小原 唯和 Obara Yuito)
- Bamba (バンバ): Tatsuya Kishida (岸田 タツヤ Kishida Tatsuya)
- Canalo (カナロ Kanaro): Katsumi Hyodo (兵頭功海 Hyōdō Katsumi)
- MosaRex (モサレックス MosaRekkusu, Voice): Ryota Takeuchi (竹内 良太 Takeuchi Ryōta)
- Naohisa Tatsui (龍井尚久 Tatsui Naohisa): Mitsuru Fukikoshi (吹越満 Fukikoshi Mitsuru)
- Ui Tatsui (龍井 うい Tatsui Ui): Mana Kinjo (金城茉奈 Kinjō Mana)
- Oto (オト Oto): Sora Tamaki (田牧そら Tamaki Sora)
- Kleon (クレオン Kureon, Voice): Ryoko Shiraishi (白石 涼子 Shiraishi Ryōko)
- Gachireus (ガチレウス Gachireusu, Voice): Tetsu Inada (稲田 徹 Inada Tetsu)
- DON Jiro (DONじろう Don Jirō): Yohei Kaneshige (金重陽平 Kaneshige Yōhei)
- Riruko Asaoka (阿佐岡りるこ Asaoka Riruko): Asuka Takahashi (高橋明日香 Takahashi Asuka)
- Koji Muto (武藤浩二 Mutō Kōji): Kuniyuki Horita (堀田訓幸 Horita Kuniyuki)
- Mother: Mariko Horita (堀田真理子 Horita Mariko)
- Akari (愛花里): Rinko Kawakami (川上凛子 Kawakami Rinko)
- Ryusoul Red: Shigeki Ito (伊藤茂騎 Itō Shigeki)
- Ryusoul Blue: Masashi Takada (高田 将司 Takada Masashi)
- Ryusoul Pink: Ayumi Shimozono (下園 愛弓 Shimozono Ayumi)
- Ryusoul Green: Masato Tsutamune (蔦宗 正人 Tsutamune Masato)
- Ryusoul Black: Yasuhiro Takeuchi (竹内 康博 Takeuchi Yasuhiro)
- Ryusoul Gold: Kazuya Okada (岡田 和也 Okada Kazuya)
- Tyramigo: Toshihiro Ogura (おぐら としひろ Ogura Toshihiro)
- KishiRyuOh: Yohei Fujita (藤田 洋平 Fujita Yōhei)
- Kureon: Naoko Kamio (神尾 直子 Kamio Naoko)
- Gachireus: Hirotsugu Mori (森 博嗣 Mori Hirotsugu)
- Pan Minosaur: Shinsuke Kusano (草野 伸介 Kusano Shinsuke)
Form Changes and Collectibles Used
- Ryusoul Red - MeraMera, Red (Dino Slash), Red (Tyramigo)
- Ryusoul Blue - Kata, Blue (Triken)
- Ryusoul Pink - Mawari, Pink (Ankyloze)
- Ryusoul Green - Karu, Green (TigerLance)
- Ryusoul Black - Tsuyo, Black (MilNeedle)
- Ryusoul Gold - BiriBiri, Nobi
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- As part of Super Hero Time, this episode aired alongside Kamen Rider Zi-O episode 41, 2019: World, Reset.
- Viewership: 3.4%
- Ryusoulger featured in title card: Red
- The opening theme has been updated with Canalo, Kishiryu MosaRex, the AmmoKnuckles, and KishiRyuNeptune.
- The ending sequence has also been updated with Canalo and Kishiryu MosaRex.
- MosaRex saving Oto by swallowing her may be an homage to Jurassic World when the Mosasaurus swallows Zara and the Pteranodon.
- This is the first episode since his debut where Wizeru does not appear.