His goal is to help the weak and defenseless, but his saving a mouse makes him the most wanted in all the land. On the run from incessant, dim-witted mice, Perro befriends a young miller's boy, Pierre; together, they decide to seek fame and fortune. When they cross paths with the lovely Princess Rosa, Perro determines to get Pierre hitched to Her Royal Highness.

Brave cat Pero once had a bet with treacherous multimillionarie Grumon that he can travel around the world in 80 days. The stake is high, in case of success Grumon will give all of his fortune to Pero, but in case of failure Pero becomes slave of Grumon for the rest of his life. Pero departs together with his faithful friends behemoth Kato and brave Small Mouse. Grumon tries everything to prevent their arrival to the finish.

Pero is back in Go Go Town, a fearful place in the Wild West that desperately awaits for a sheriff to come. In this town of no law and order, Pero and a boy named Jimmy try to help Annie, daughter of a saloon owner who has just been killed.