Just two years ago, the media turned Detective John Spader into a hero. He'd caught a twisted serial killer terrorizing Massachusetts, and the "Jack of Spades," as the media dubbed Spader, was born. But when the murderer walked free on a technicality - free to kill again - the public turned on Spader. Now a new serial killer is on the loose. He wears the silly, gap-toothed, grinning mask of Galaxo, Starboy Avenger! - a cartoon alien of unparalleled popularity with children. With Galaxo's body count rising, and the public's fear growing, it's up to the Jack of Spades to find the man beneath the mask and stop the killing.