- 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
A Class-M planet and Federation member in 2268, despite its dual system — the privileged upper-class lives in the city of Stratos, considered the finest example of sustained antigravity elevation in the galaxy, while the lower-class Troglytes stay on the surface, forced to mine zenite. Captain James Kirk helped end years of mistrust bewteen the two in 2269 while retrieving zenite to stop a plague.