Sgt. Frog Episode 174: Keroro, Butchered Hair, and the Afro Ondo? / Dororo, Mysterious Mountain
Episode 174 of 358 of Sgt. Frog, aired August 18, 2007, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Keroro and his squad hold a concert for worldwide broadcast, featuring DANCE☆MAN! (Or is it...?) Then, while everyone is visiting Grandma Akina, Dororo meets a mysterious girl in the mountains. Source: crunchyroll