Episode 319
An alien virus jumps from Mois's laptop to the underground base's mainframe and then really wreaks havoc! Then a sentient antique clock from space arrives for Keroro. To help the kindly clock regain its memories, Kululu participates in a tense black market auction. Source: crunchyroll
Aired 19/06/2010EP 319 - Episode 319
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)