Sgt. Frog Season 4 Episode 191 Keroro: That Guy and the Lullaby Legend, Sir! / Keroro: Mighty Plastic Model Battle, Sir!

When Mom is ready to retire their old vacuum cleaner for a new model, vacuum jockey Keroro soups up the machine so the Hinatas will keep it, but maybe Keroro makes it a bit too powerful... Later, Keroro has forgotten the important thing about building plastic models until a mysterious masked figure challenges him to a model-building competition.