|This article is about a/an episode in Choudenshi Bioman.|
Kill the Unseen Enemy (見えない敵を斬れ Mienai Teki o Kire) is the fifth episode of Choudenshi Bioman. In the Philippine Dub the title of the episode changed to "The Curse of the Golden Rain".
In order to discourage people from indulging in a rain of coins created by an invisible Mecha-Gigan controlled by Monster, Shingo decides to become a bad criminal to get the means to stop it.
The episode begins with Shingo investigating a mysterious gathering of people. A few seconds later, a rich man arrives and claims to the people that gold will be falling from the sky into the park. The people rush to the park, including a boy rebelling against his sister, but Shingo follows the rich man to an building and discovers that he's really Monster. Meanwhile, Red1 and Pink5 discover gold coins following from the sky, when they are suddenly attacked by an invisible Mummy Canth. Green2 discovers that Monster has a special pair of glasses to see Mummy Canth. He tries to sneak in, but get ambushed by Zyuoh and the Mechaclones. After escaping, Green2 finds that Monster is gone. Shingo goes undercover and steals some coins from some punks, but soon begins acting like a bad boy. He meet the sister who tells him about her brother's behavior. Suddenly, Shingo gets ambushed by the punk and his cover is blown by the Mechaclones, who capture him. Zyuoh and Monster beat up Shingo, but Shingo steals the glasses and escapes to a construction site. Shingo gets cornered by Gear, but is rescue by the Biomen. After defeating the Mechaclones, the Biomen try to stop Monster and Zyuoh, but they get outnumbered by the evil's combined strength, until they defeat Beastking with the Bio Electron Beam. All of a sudden, Mummy Canth shows up. The Biomen combine the Biojets to form the Bio Robo. Using the glasses, Bio Robo manages to find Mummy Canth, but Mummy Canth wraps his metal tape around Bio Robo, making it difficult for Bio Robo to see, until Bio Robo destroys Mummy Canth with the Comet Cutter. Shingo later meets up with his team, but the team notices Shingo wearing sunglasses. The team takes off the glasses, revealing that Shingo has a black eye on his left eye, and the episode ends.
- Shirou Gou (郷 史朗 Gō Shirō): Ryōsuke Sakamoto (阪本 良介 Sakamoto Ryōsuke)
- Shingo Takasugi (高杉 真吾 Takasugi Shingo): Naoto Ōta (太田 直人 Ōta Naoto)
- Ryuuta Nanbara (南原 竜太 Nanbara Ryūta): Akito Ōsuga (大須賀 昭人 Ōsuga Akito)
- Mika Koizumi (小泉 ミカ Koizumi Mika): Yuki Yajima (矢島 由紀 Yajima Yuki)
- Hikaru Katsuragi (桂木 ひかる Katsuragi Hikaru): Michiko Makino (牧野 美千子 Makino Michiko)
- Peebo (ピーボ Pībo, Voice): Yoshiko Ōta (太田 淑子 Ōta Yoshiko)
- Doctor Man (ドクターマン Dokutā Man): Munemaru Kōda (幸田 宗丸 Kōda Munemaru)
- Mason (メイスン Meisun): Hirohisa Nakata (中田 博久 Nakata Hirohisa)
- Farrah (ファラ Fara): Yōko Asuka (飛鳥 裕子 Asuka Yōko)
- Monster (モンスター Monsutā): Strong Kongō (ストロング金剛 Sutorongu Kongō)
- Zyuoh (ジュウオウ Jūō, Voice): Masahiro Anzai (安西 正弘 Anzai Masahiro)
- Makoto Tajima (田島誠 Tajima Makoto): Hidekazu Kudo (工藤秀和 Kudo Hidekazu)
- Makoto's sister: Junko Kurahashi (倉橋順子 Kurahashi Junko)
- Gangs: Kazuhiro Uchima (内間和浩 Uchima Kazuhiro), Tsuyoshi Yamaguchi (山口 剛 Yamaguchi Tsuyoshi), Ryozo Mihara (美原亮三 Mihara Ryōzō), Heihachiro Eda (江田平八郎 Eda Heihachirō)
- Mecha Human Disguise: Shinsuke Fujizawa (藤沢慎介 Fujizawa Shinsuke), Hiroaki Takeuchi (竹内浩昭 Takeuchi Hiroaki), Kenji Shimozaki (下崎憲治 Shimozaki Kenji), Yutaka Hirose (広瀬 裕 Hirose Yutaka)
- Red1: Kazuo Niibori
- Green2: Makoto Kenmochi
- Blue3: Tsutomu Kitagawa
- Yellow4: Keiji Tsujii
- Pink5: Michihiro Takeda
- Peebo: Nahoko Nomoto
- BioRobo: Hideaki Kusaka
- Zyuoh: Noriaki Kaneda
- Mummy Canth: Hirofumi Ishigaki
Choudenshi Bioman Volume 1 features episodes 1-11.