Mars, the far future. Tasked with increasing the peace on the war-ravaged Red Planet, the A.B.C. Warriors are reunited with one of their oldest number - the mechanic known as Tubal Caine AKA Happy Shrapnel. As Happy explains how he died and was subsequently resurrected by Medusa (the planetary consciousness), his story exposes the identity of the villain responsible for most of the trouble on Mars.