A computer-animated re-imagining of the hit '80s cartoon of the same name, which depicted the adventures of a group of cat-like humanoid aliens from the annihilated planet Thundera who seek refuge on the planet Third Earth. There they befriend the indigenous people and protect them from their enemies: the villainous invading Mutants from the planet Plun-Darr; and the ancient undead sorcerer Mumm-Ra.