This ThunderCats t-shirt shows the animated series' classic logo burning bright in a bursting image. From 1985 to 1989, ThunderCats was one of the most popular cartoons on television. The series followed heroic Thunderians who fled their dying planet, and were chased by the Mutants of Plun-Darr to Third Earth. There, the ThunderCats and Mutants battled for control of the Sword of Omens.