Leonard Nimoy appeared in the science-fiction TV series Zombies of the Stratosphere (1952) before “Star Trek” (NBC, 1966-69).
Nimoy played Narab, a Martian.
Kristin Shepard (Mary Crosby), J. R.’s sister-in-law, shot J. R in the last episode of the 1979-80 season of “Dallas” (CBS, 1978-91). J. R. Ewing was played by Larry Hagman.
The TV series “Happy Days” (ABC, 1974-84) generated three spinoffs: “Laverne and Shirley” (ABC, 1976-83) “Mork and Mindy” (ABC, 1978-82) “Joanie Loves Chachi” (ABC, 1982-83).
Yvonne Craig played Batgirl on the TV series “Batman” (ABC, 1966-68). She appeared only in the second and final season. Batgirl’s real identity was Barbara Gordon, Police Commissioner Gordon’s daughter.
Don Novello played Father Guido Sarducci on “Saturday Night Live” (NBC, 1975), who has since gone on to occasional roles in films such as The Godfather Part III (1990).
Hawkeye’s real name on the TV series “M*A*S*H” (CBS, 1972-83) was Benjamin Franklin Pierce.
Michael St. Gerard played Elvis in the short-lived TV series “Elvis” (ABC, 1989-90).