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1 episode
Kero 0: Shuppatsu da yo! Zenin Shuugou!
ケロ０ 出発だよ！全員集合！！
Sinopsis
This is episode 0, the prequel to the main Keroro Gunsou anime series. KeroZero was shown in theaters with Keroro Gunsou Movie 4.
On the day of Keroro battalion's departure from Keron Planet to Planet Earth, an opposing alien species assails the Keron space station, where Giroro and Zeroro (later known as Dororo) are waiting for Keroro to arrive.
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