The first of two occasions where Tige Andrews and Michael Ansara were castmates, the two actors later both playing Klingons on Star Trek (1966), the later occurrence of their working together being in an episode of Andrews' later regular series Mod Squad (1968), when Ansara guest starred in the episode A Double for Danger (1971). Ansara would later reprise his Klingon role of Kang from Day of the Dove (1968), teaming with two other actors who played Klingons in the original series--John Colicos (Kor from Errand of Mercy (1967)) and William Campbell (Koloth from The Trouble with Tribbles (1967), also having played the non-Klingon character Trelane in The Squire of Gothos (1967))--when the three legendary Klingons would join forces in the sequel series Star Trek: Deep Space Nine (1993) in the episode Blood Oath (1994). Andrews, whose Klingon character Kras was not mentioned by name in the original series episode Friday's Child (1967) and did not survive the episode, never worked with either Colicos or Campbell.