Big Wolf on Campus - Season 3 Episode 10 Very Pale Rider

Merton's role-playing game comes to life, as he is transported to another dimension where he must fight a real fire-breathing monster. Afraid, he decided to return to Merton's world and retrieve help from Tommy. The only problem is that Tommy is acting like Gandhi. The monster, who was a Shederack enters their world, and Tommy, and Merton has to destroy it before he destroys Pleasantville, and so it cannot return to Ursula's world and rule it.