|This article is about a/an episode in Mashin Sentai Kiramager.|
|WARNING: This episode contains scenes of murder, character death, and mild nudity. Viewer discretion is advised!|
Episode 13: Great Underground War (地底大戦争 Chitei Dai Sensō) is the thirteenth episode of Mashin Sentai Kiramager. It reveals the origin of Takamichi Crystalia and the debut of Super Heavy Machine Drijan.
Takamichi Crystalia was revealed to be none other than Mabushina's older brother? However, Mabushina strongly rejects Takamichi, who thinks that his voyager-like heart would lead to problems. The reason being was when Yodonheim invaded Crystalia, Takamichi was off treasure hunting. The Kiramagers were sent out into the city immediately to handle a tentacle monster attacking everyone. While Takamichi awaits for the completion of his new high-tech Mashin being prepared by Mr. Hakataminami, he goes off to hunt for some more treasure. Meanwhile, Juru, who feels that Takamichi's words and actions can't truly represent his true feelings, starts to further question the situation.
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- Juru Atsuta (熱田 充瑠 Atsuta Jūru): Rio Komiya (小宮 璃央 Komiya Rio)
- Tametomo Imizu (射水 為朝 Imizu Tametomo): Rui Kihara (木原 瑠生 Kihara Rui)
- Sena Hayami (速見 瀬奈 Hayami Sena): Yume Shinjo (新庄 由芽 Shinjō Yume)
- Shiguru Oshikiri (押切 時雨 Oshikiri Shiguru): Atom Mizuishi (水石 亜飛夢 Mizuishi Atomu)
- Sayo Oharu (大治 小夜 Ōharu Sayo): Mio Kudo (工藤 美桜 Kudō Mio)
- Takamichi Crystalia (クリスタリア宝路 Kurisutaria Takamichi): Kohei Shoji (庄司浩平 Shōji Kōhei)
- Muryou Hakataminami (博多南 無鈴 Hakataminami Muryō): Daimaou Kosaka (古坂大魔王 Kosaka Daimaō)
- Princess Mabushina (マブシーナ姫 Mabushīna-hime, Voice): Inori Minase (水瀬 いのり Minase Inori)
- King Oradin (オラディン王 Oradin Ō, Voice): Tomokazu Sugita (杉田 智和 Sugita Tomokazu)
- Mashin Fire (魔進ファイヤ Mashin Faiya, Voice): Kenichi Suzumura (鈴村 健一 Suzumura Ken'ichi)
- Mashin Shovellow (魔進ショベロー Mashin Shoberō, Voice): Mitsuo Iwata (岩田 光央 Iwata Mitsuo)
- Mashin Mach (魔進マッハ Mashin Mahha, Voice): Kenji Akabane (赤羽根 健治 Akabane Kenji)
- Mashin Jetter (魔進ジェッタ Mashin Jetta, Voice): Genki Okawa (大河 元気 Ōkawa Genki)
- Mashin Helico (魔進ヘリコ Mashin Heriko, Voice): Yuki Nagaku (長久 友紀 Nagaku Yuki)
- Demonic General of Betrayal Galza (裏切りの鬼将軍ガルザ Uragiri no Oni-Shōgun Garuza, Voice): Yuuichi Nakamura (中村 悠一 Nakamura Yūichi)
- Woman: Mutsumi Igarashi (五十嵐睦美 Igarashi Mutsumi)
- Man: Akira Sekiguchi (関口あきら Sekiguchi Akira), Shunya Sasaki (佐々木駿也 Sasaki Shunya)
- Girl: Yuno Ōta (太田 結乃 Ōta Yuno)
- Kiramai Red: Shigeki Ito (伊藤茂騎 Itō Shigeki)
- Kiramai Yellow: Masato Tsutamune (蔦宗 正人 Tsutamune Masato)
- Kiramai Green: Ryoko Gomi (五味 涼子 Gomi Ryōko)
- Kiramai Blue: Yasuhiro Takeuchi (竹内 康博 Takeuchi Yasuhiro)
- Kiramai Pink: Ayumi Shimozono (下園 愛弓 Shimozono Ayumi)
- Kiramai Silver: Masashi Takada (高田 将司 Takada Masashi)
- King Oradin, Mashin Gattai Kiramaizin: Yohei Fujita (藤田 洋平 Fujita Yōhei)
- Princess Mabushina: Mizuho Nogawa (野川 瑞穂 Nogawa Mizuho)
- Demonic General of Betrayal Galza, Darkness Megabeast Mecha Smog Jouki: Keizo Yabe (矢部 敬三 Yabe Keizō)
- Haejigoku Shellga: Kenya Saito (齊藤謙也 Saitō Kenya)
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- Viewership: TBA
- As part of Super Hero Time, this episode aired alongside Kamen Rider Zero-One episode 37, It Can't Be Stopped.
- Pre-Credits Scene: Shovellow attempts and fails to recruit Drijan into his crew of Mashins.
- The title of the episode is a reference to the film The Terror Beneath the Sea , also known as Water Cyborg or The Great Seafloor War (海底大戦争 Kaitei Daisensou), a 1966 film produced by Toei in collaboration with Ram Films.
- Shoji Kohei/Takamichi is given a credit in the opening sequence, although it is text only. He would later be included in the opening in the next episode.
- Two extras in the episode were named "Kotaro" and "Minami" respectively, a reference to Kohtaro Minami, also known as Kamen Rider Black/Black RX.
- In a scene where Juru is reaching his hand out to Takamichi, a poster can be seen in the background reading "Perfect Performance And Physical". This is a nod to Muryou Hakataminami's actor, Daimaou Kosaka, who is most known for singing the song, "PPAP (Pen-Pineapple-Apple-Pen)".
- Episode 5, timestamp 07:38, is the first full appearance. We just overlooked it.
- Muryou is seen wearing a jersey with the logo of the real life football team, the Green Bay Packers.
- This is likely the first episode to be shot after production restarted. There are some noticeable differences in this episode compared to the last, such as Tametomo's hair being brighter, Juru's hair being slightly longer, and some noticeable social distancing between the cast.