- 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
The ambassador from planet Troyius assigned to accompany Elaan, the Dohlman of Elaas, to his homeworld where she would then marry his planet's leader. However, Petri was stabbed en route aboard the U.S.S. Enterprise by the temperamental Dohlman. Part of Petri's assignment was to teach the Dohlman manners so that she would be more acceptable to his leader as a bride of peace.