The Garfield Show season 2 episode 23
Episode title: Garfield Astray
After Garfield plays a mean trick on Nermal, a bowling ball falls on his head and loses his memory. Then, Nermal tricks Garfield into thinking he's a stray cat named Ichabod. Then Garfield meets a couple of stray cats named Tino and Gino. This is Tino and Gino's first appearance.
