Power Pack [Zero-G [Alex Power]; Lightspeed [Julie Power]; Mass Master [Jack Power]; Energizer [Katie Power]]; Fantastic Four [Mr. Fantastic; Invisible Woman; Human Torch; The Thing]; Dr. Doom (villain); Doombots (villains)
While off on a camping trip, the Power kids run across one of Doom's secluded castles and Jack gets into trouble trying to take on the villain by himself. He shouldn't feel too bad about it because the Human Torch gets into the same jam. The two teams converge to rescue their captured comrades.