Sgt. Frog Episode 55: Armagarden!
Episode 55 of 358 of Sgt. Frog, aired April 22, 2005, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Giroro returns, and he`s well on the path to conquering the city with a jungle of monstrous alien plants. Natsumi, however, is determined to stop him. She has never lost to Giroro once, and she doesn`t intend to start now! Source: crunchyroll