Sgt. Frog Episode 23: The Clone Wars (The Unsucky Version)!
Episode 23 of 358 of Sgt. Frog, aired September 4, 2004, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Keroro steals the Kero Ball from Fuyuki's room, and accidentally clones hundreds of himself, all just as lazy as the original. Kururu's attempt to rectify this situation turns them into mindless drones under Keroro's control, but just as this new power starts corrupting him, Kururu discovers that the malfunctioning Kero Ball may pose a bigger threat to Keroro himself.