 The annual Water Buffalo masquerade ball is around the corner. Fred and Barney have a fight since they have the same (devil) costume. Fred decides to make his costume secret, even putting booby traps against Barney. On the night of the party, a massive radio promotion for a rock group turns to a close riot in Bedrock: the Way-Outs, using a Martian gimmick are promotion their new hit. And this does not help Fred, who is dressed as a Space Man for the ball.