“YOU CAN’T KEEP A GOOD VILLAIN DOWN.” Matter-Eater Lad’s home planet, Bismoll, is being threatened by the evil Pulsar Stargrave! Can the Subs (including Polar Boy, Chlorophyll Kid, Infectious Lass, Fire Lad, Porcupine Pete and Stone Boy) save the planet? What strange things will happen to them? Especially to Color Kid?

The Legion of Substitute Heroes are summoned by Tenzil Kim of Bismoll because he has a hunch that something bad will occur on his planet. Soon afterwards, Pulsar Stargrave arrives to control the planet. The Legion of Substitute Heroes are able to defeat Pulsar Stargrave with the help of Matter-Eater Lad, saving the planet of Bismoll.