- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
A species of highly intelligent noncorporeal beings whose sensory systems differ radically from humanoid sensory systems. This makes the Medusans particularly well suited for space travel.
While noncorporeal, Medusans still have a physical form, which when viewed by humanoids is said to be so ugly, that it will cause madness in the viewer unless that humanoid has the protection of a visor. In contrast, for those with telepathic capabilities, the Medusan mind is said to be remarkably beautiful.