In the greatest crossover since peanut butter met jelly, The Powerpuff Girls travel from Townsville to Third Earth and discover the world of the ThunderCats! After being trapped in a runaway rocket by Mojo Jojo, the titanic trio find themselves on a strange planet where their super-powers don't work. Luckily, someone named Snarf is there to provide a situation report and wouldn't you know it, there's evil that needs defeating! But without their Chemical X-enhanced abilities, what can Bubbles, Blossom, and Buttercup do against a foe like Mumm-Ra?