Get Smart (1965) : 5x10

Several agents have been murdered by someone with incredible strength. The only clue is an empty banana peel. It is soon deduced that the killer is an ape. CONTROL agents are receiving bananas in the mail and then being murdered, completely puzzling CONTROL. What they don't know is KAOS is using Chucko, an ape made to look like a human being, as the assassin. The plot thickens when Max receives a banana in the mail and a new agent, Chuck Armstrong, is assigned as his protector. Unfortunately, Armstrong is actually Chucko the Ape. Before Max discovers Armstrong's real identity, Armstrong reverts back to Chucko and takes 99 to the roof of Max's building, just like in King Kong.