- 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
Protocol Master for Minister Campio of planet Kostolain. Erko strongly disapproved of Campio's decision to marry Ambassador Lwaxana Troi in 2368, correctly maintaining that Troi's disregard of protocol would strongly offend Kostolain sensibilities.