10 Star Trek Characters We Had To Wait Years To See Again

10. Swear A Blood Oath

Featured in each of the three seasons of The Original Series respectively, Kor (John Colicos), Koloth (William Campbell), and Kang (Michael Ansara) would wait up to 27 years for a return to Star Trek in Deep Space Nine's second season Blood Oath. Interestingly Colicos is the only one of the three who would not play at least one other role in Star Trek.

While (spoilers!) Koloth and Kang would meet their deaths avenging their murdered sons against the Albino, Kor returned for two more appearances in The Sword of Kahless and Once More Unto the Breach providing the character with his own Deep Space Trilogy.

As the first Klingon in Star Trek, John Colicos faced not just Kirk and Spock but also the Organians (hold that thought) during Errand of Mercy. His performance would set the standard for the warrior race throughout the ages with the baldric inspired from his first appearance still worn by Worf in Star Trek: Picard.

The character also managed an impressive arc through his later appearances. Recovering from being a washed-out drunken Da'Har Master, Kor goes full Indiana Jones to recover the fabled sword of Kahless before dying an honourable death against the Dominion.