Famed character actor Michael Ansara played the Klingon warrior Kang, who would again appear on Star Trek Deep Space Nine nearly 30 years later in the episode "Blood Oath." Ansara appeared in that later episode along with William Campbell and John Colicos, who played the Klingons Koloth and Kor in the original Star Trek series. Although they were largely considered the Federation's greatest foes in the original Star Trek, the Klingons only appeared in five of the show's 79 episodes. The Klingons first appeared in "Errand of Mercy," followed by "Friday's Child," "The Trouble With Tribbles," "Day of the Dove" and "The Savage Curtain."
