Episode 315
Havoc is wreaked when a parasitic space flower takes root on Keroro's head and starts spewing out Keroro clones. Later, Fuyuki has to capture his renegade shadow before he fades out of existence! Source: crunchyroll
Aired 22/05/2010EP 315 - Episode 315
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)