- 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
An indefinable life-form studying the crew of the U.S.S. Enterprise NCC-1701-D in 2365 in the Morgana Quadrant. Nagilum felt justified in his terrifying approach to learning about life and death.