Sgt. Frog Season 5 Episode 218 Chibi Kero: Lend Me Your Ears, Sir! / Keroro: Caries War 2, Sir!

First, Keroro and his friends in childhood find a broken-down robot that they try to repair. Then, back in the present, they have to fight a Caries War inside Keroro again! But something seems funny about these mouth-invaders...