When Super Simon has to go and do his scout badges, Marty is thrilled to help him. But Super Simon takes all the credit and Marty gets jealous and sabotages his hero, forgetting the true meaning of Toon Scouts.

Marty and Underworld Marty swap places on Halloween. Underworld Marty goes trick-or-treating with Burnie and Holly, while real Marty is trapped below, where the underworldly inhabitants want to make a meal of him.

When Marty and Burnie accidentally kill the frozen Cavetoon who can save them from a dinosaur attack, Marty gets caught in bigger and bigger lies.

An overworked Marty soaks in Burnie's hot tub, but his colours drain and he looks like an old-timey toon. Locked up in an old folks home, he must get his colour back and escape before the trio is trapped forever.

Marty is cursed by Grizelda and loses all his tooniness. Marty has got to break the curse, but without a sense of humour and stripped of his toon-ability to sustain physical injury.

Marty gets so smart that his head expands. Dr Smartypants tells Holly and Burnie that if he learns one more thing his head will explode. While keeping all new information from him, they try to bring him back to normal.