There is a new superhero in Metropolis, Booster Gold, but he seems more interested in glory and popularity, then in actually doing good, so a suspicious Superman decides to find out just who this person is and where he comes from--and what he is planning for the future.

Parasite can absorb energy from any power source and after being struck by lightning he hits nuclear power plants and electrical stations, greedy for more--can Superman find a way to stop him before he becomes too strong for even the Man of Steel?

When an unusual solar flare damages his space shuttle and causes astronaut Hank Henshaw and his crew--including his wife--to mutate, he blames Superman and as his surviving consciousness learns to fuse with technology he vows revenge.

Mr. Mxyzptlk, a mischievous imp from the Fifth Dimension, is on the loose in Metropolis, and causing mayhem with his tricks--so it is up to Superman to find a way to reverse the magic and send Mxy back where he belongs.