Keroro, Flowers for Algernainon / Giroro, Oh! Ferocious Ox
Super-intelligent mice have invaded the house! And then, Keroro tries transforming Giroro into a cow as part of an invasion operation. But Giroro being male, he turns into a {\i0}bull{\i1}... a terrifying minotaur-like creature, to be exact. Source: crunchyroll
Aired 23/10/2010EP 337 - Keroro, Flowers for Algernainon / Giroro, Oh! Ferocious Ox
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)