Cow and Chicken

The Karate Chick (2x17)

Air date: Mar 10, 1998

After Chicken's beak is bruised by Dick, his school bully, Mom and Dad send him to karate lessons. Chicken takes up butt-fu from The Red Guy, but when Chicken still is unable to beat up Dick, Chicken decides to force a refund (with help from an invisible Super Cow).