Dennis the Menace - S01EP15 Up, Up and Away (from here)/Going Ape/Dennis the Pirate

Dennis, George, Henry, and Joey all enter a balloon race. Dennis wins the race, but only after a wild series of adventures. A take-off on King Kong, in which PeeBee, experimenting with a gas-filled balloon, loses control of it, and he, Dennis, Margaret, and Joey, are carried off, ending up on a banana-shaped island. There they meet a giant ape, who falls instantly in love with Margaret. Returning home by raft, they put the giant ape in show biz, doing a ballet dance duo with Margaret. During the show, the ape panics... and so does the audience! The ape climbs a high tower, and falls. But the balloon the kids have sent up catches him, and he's floated safely back to his island home. Dennis and his parents visit Pirateland and take the Pirate's Run, the wildest ride in the park. Dennis takes charge of the ride and throws the entire amusement park into chaos.