Tonton Streaming Heathcliff and the Catillac Cats (1984) S1E56 - Mungo's Dilemma

Riff Raff sees a picture of a cat that looks like Mungo in the paper for which a reward is offered. The cats turn Mungo in and collect the reward, only to find they have left their friend in the clutches of a mad scientist. A rescue plan saves Mungo just in the nick of time.