Serpent of Evil River:
The Bagges take a fishing trip and the captain that wants to catch a serpent that lives in the river that they're on. He uses Muriel as bait and the serpent captures her. Courage goes down to save her and the captain goes after her and Courage finds out that she wants to sing opera and Courage saves Muriel.
Courage finds the skeleton of a extinct kangaroo monster. Eustace sells them to scientists and he soon falls of the roof, they have to transplant a bone from the kangaroo monster. During the night Eustace turns into a kangaroo monster, captures Muriel and starts rampaging the world. Courage gets a bone from the kangaroo too and rescues Muriel.