Sergeant Keroro: Kero 0 [646429] Released: 2009-04-30 Revenue: $0 Budget: $0 Profit: $0 Runtime: 15 mins Popularity: 0.6536 Vote Average: 0 Vote Count: 0 Overview: This is episode 0, the prequel to the main Keroro Gunsou anime series. KeroZero was shown in theaters with Keroro Gunsou Movie 4. Cast [5] Kumiko Watanabe Etsuko Kozakura Jouji Nakata Takehito Koyasu Takeshi Kusao Trailers