- 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
Spacecraft drive system that used magnetic fields to drive electrically charged gases. Ion propulsion was used in Class F shuttlecraft in the 2260s, but its application by a ship from Sigma Draconis VI left Montgomery Scott speechless upon first contact in 2268. Its ion wake was easily detectable.