Star Trek: The Original Series
Episode: TOS 063 - Empath, The

Origin: unspecified.

A technologically advanced humanoid race with enlarged cranial cavities, capable of injuring their subjects by magnifying the power of their own thoughts. On stardate 5121.5, the Vians used the crew of the U.S.S. Enterprise NCC-1701 landing party as subjects to test the worthiness of a species for survival in a threatened star system.