- 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
Vorta administrator during the Dominion War. Gelnon was in charge of a squadron of newly-bred "Alpha" Jem'Hadar soldiers that captured the U.S.S. Defiant on stardate 51474.2. Gelnon proceeded to plan a Dominion attack on the dilithium-rich Coridan planets, but was undone by Defiant crewmembers aboard a miniaturized runabout.