ThunderCats (Seasons 1–4)

ThunderCats (1985) is a sci-fi fantasy cartoon you can watch online on iFILM. The planet Thundera is dying. A handful of cat warriors flee aboard the last surviving ship and set course for a distant star.

Mutants ambush the convoy mid-flight. The flagship crash-lands on a wild world called Third Earth, and the survivors save the one thing that matters: the Sword of Omens, their people's ancient relic. Young Lion-O takes up the mantle of leader. Around him stand the powerhouse Panthro, the swift Cheetara, and the ghostly mentor Jaga. Trouble follows fast. The same mutants accidentally wake Mumm-Ra, a centuries-old sorcerer who craves the Sword for himself.

A joint American and Japanese production, the show became a defining piece of 1980s animation, all bold character design, a knightly code of honor, and a fight for survival on alien ground. Larry Kenney and Earle Hyman lead the voice cast. Stream ThunderCats (1985) online on iFILM.