Episode 325
The Keroro Platoon doesn't seem to be noticeable enough to the Hinatas -- so they paint themselves in crazy Gundam model colors in order to become more noticeable. Then Keroro has an invasion plan that involves turning human makeup crazy! Source: crunchyroll
Aired 31/07/2010EP 325 - Episode 325
Sgt. Frog
Keroro is a frog-like alien sent from his home planet on a mission to conquer Earth. But when his cover is blown, his battalion abandons him and he ends up in the home of the Hinata family. There, he's forced to do household chores and sleep in a dark basement that was once supposedly a prison cell haunted by the ghost of an innocent girl. He even spends his free time assembling Gundam model kits. During his stay, Keroro meets up with subordinates who were also stranded during their failed invasion.
(Source: Anime News Network)