The Wicked Wizard is a sinister spellcaster and a one-time villain from the Adventures of the Little Koala episode, Is Weather a Frog?.
At the beginning of the episode in a dream sequence, he turns his back and threatens to turn Roobear, Laura, and Floppy into frogs. Later on in the real world, he is seen dressed as a magician. Once a baseball has hit the windshield of his car, it angers him and hypnotizes Roobear, Laura, and Floppy to see things that aren't really there, including the illusion of Weather's transformation into a frog (which was proven to be false by Weather's later reappearance). At the end of the episode, he is actually shown to be on the good side and invites them all to a magic show.