Fearians are a fictional alien race featured on the 1978 Hanna-Barbera Productions television series Challenge of the Super Friends. They appeared in the second episode of the show, "Invasion of the Fearians". They were voiced by actor Michael Bell. The Fearians were an extraterrestrial conqueror race distinguished by their three heads. In a bid to take control of the planet Earth, they aligned themselves with the Legion of Doom, and created geological havoc across the globe. Ultimately they were driven off by the Legion's stalwart foes, the Super Friends.