Episode 322
Giroro's test flight of a new spaceship has run into a terrible danger, and he's afraid he'll never make it back safely again. Worse, Natsumi's towel apparently slipped, and his video feed wasn't on to see it! Source: crunchyroll
Aired 10/07/2010EP 322 - Episode 322
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)