The actor who played the first Klingon in Star Trek was also the first person to voice one of the most important X-Men villains ever.

Klingons evolved from ruthless conquerors in Star Trek: The Original ... villagers take control of the planet, eventually establishing a government loyal to the Klingon Empire.

This article contains spoilers for Star Trek: Section 31 ... Mirror Universe in the season two episode “Crossover,” the Klingon-Cardassian Alliance has ascended and humanity has been enslaved.