The spoiled Prince and the Giant episode

What is the name of the story where the spoiled prince meets the Giant in prison and is banished from he kingdom. He becomes the gardener of a nearby kingdom and faces off against an evil army with the help of the. The Giant brings about a white army from a lake in the forest. As his reward, the prince marries the princes and has learned to put others ahead of himself.

This was my favorite story as a child!

There is no escape. Don't make me destroy You!