Courage the Cowardly Dog Season 4 Episode 20
Two multi-armed aliens come to Earth to find an antidote for a disease that makes everyone on their planet beat each other up with their arms. They expriment on Eustace and Muriel, only to find they don’t have the antibodies to get the cure. Courage had the cure in him the whole time, and the aliens get it.
Serie: Courage the Cowardly Dog
Episode Title: Courageous Cure
Air Date: 2002-11-01