|This article is about a/an episode in Chikyuu Sentai Fiveman.|
Burning Sibling Robot (燃える兄弟ロボ Moeru Kyōdai Robo) is the twentieth episode of Chikyuu Sentai Fiveman. It concludes the story introducing Star Five, revealing its connection to the Hoshikawa siblings and leading to their new Super Combination machine: Super Fiverobo. It also reveals a clue regarding the possible fate of Doctor Hiroshi Hoshikawa, the father of the Fivemen.
Gaku pursues Gunther in hopes of finding out where he obtained his mecha from, as Zone tries to take advantage of the discord to crush both of their enemies.
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- Gaku Hoshikawa (星川 学 Hoshikawa Gaku): Toshiya Fuji (藤 敏也 Fuji Toshiya)
- Ken Hoshikawa (星川 健 Hoshikawa Ken): Kei Sindachiya (信達谷 圭 Shindachiya Kei)
- Fumiya Hoshikawa (星川 文矢 Hoshikawa Fumiya): Ryouhei Kobayashi (小林 良平 Kobayashi Ryōhei)
- Kazumi Hoshikawa (星川 数美 Hoshikawa Kazumi): Kazuko Miyata (宮田 かずこ Miyata Kazuko)
- Remi Hoshikawa (星川 レミ Hoshikawa Remi): Ryo Narushima (成嶋 涼 Narushima Ryō)
- Arthur G6 (アーサーG6 Āsā Jī Shikkusu, Voice): Rica Matsumoto (松本 梨香 Matsumoto Rika)
- Doctor Hoshikawa (星川博士 Hoshikawa Hakase): Kiyotaka Mitsugi (三ツ木清隆 Mitsugi Kiyotaka)
- Galactic Empress Meadow (銀河皇帝メドー Ginga Kōtei Medō): Chika Matsui (松井千佳 Matsui Chika)
- Galactic Empress Meadow (Voice): Keiko Konno (金野恵子 Konno Keiko)
- Captain Garoa (ガロア艦長 Garoa-kanchō): Takeshi Ishikawa (石川武 Ishikawa Takeshi)
- Gunther (グンサー Gunsā): Hideaki Kusaka (日下 秀昭 Kusaka Hideaki)
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- This episode marks the overall 700th episode of the Super Sentai franchise.
- Both Kazumi and Remi are switching their hairstyles in this episode as Remi is seen in a ponytail while in her second outfit while Kazumi's hair is loose while in her third outfit.
- After the robot clash and both FiveRed and Gunther fell into the edge of the cliff in the previous episode, FiveRed reverts back into Gaku who is now hurt and weaken and was competed each other by Gunther in whoever pilots the Star Five from climbing back up and wants to know answers but it was soon interrupted by the Galactic Monster.
- Marks the first time Ken, Fumiya, Remi and Kazumi are piloting the Fiverobo in their untransformed appearance before Gaku's arrival as FiveRed who now pilots the Star Five.
- Gaku finally keeps Gunther's Axe in the end of the episode after the former sacrificing his life to save him from being attacked until he becomes petrified.
Chikyuu Sentai Fiveman Volume 3 features episodes 19-28.