- 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 Iyaaran ambassador, Byleth, in 2370, was assigned to monitor the emotion of antagonism while undergoing a cultural exchange with members of the U.S.S. Enterprise-D crew.