- 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
In 2362, Leijten, along with Geordi La Forge and three other crewmembers serving on the U.S.S. Victory, was exposed to an alien retro-DNA on Tarchannen III. In 2367, the DNA nearly overtook Leijten, mutating her into a humanoid creature that could only be seen via UV light.