The Hex Girls are in town to perform a concert, but a phantom is attempting to keep them from playing. Meanwhile, Scooby-Doo is still angry at Shaggy for going to the prom with Velma, so he makes a new best friend, a dummy called Harry.
"Listen, Hex Girls, carefully. You are bound for misery! This will be your final show. Or you will suffer endless woe! So saith the Phantom."
— Phantom to the Hex Girls '
"Could you make me a rock-star, too?" (long silence) "Or I could just do it myself. Good idea."
— Velma to the Hex Girls '
"I'm tired of being afraid. I have feelings, world, for traps and Daphne. I'm a guy no more. I'm coming, Daphne!"
— Fred '
"Or, like, we could call you Fantzee Pantz. Fantzee Pantz?"
— Shaggy and the Hex Girls '