Yippee, Yappee and Yahooey is a Hanna-Barbera animated television series that premiered September 16, 1964. It was presented as a segment of The Peter Potamus Show, along with Breezly and Sneezly and Peter Potamus.
The king of the neighboring kingdom invades because it always rains in his kingdom. He comes with a giant mechanical knight who bashes Yippee, Yappee and Yahooey. But they win in the end.