Quantum Leap (1989–1993)
- Terry Farrell and J.G. Hertzler and Marc Alaimo co-starred on Star Trek: Deep Space Nine (1993) and they also made guest appearances on "Quantum Leap".
- Robert Duncan McNeill who co-starred on Star Trek: Voyager (1995) and also appeared in Quantum Leap: Good Night, Dear Heart - November 9, 1957 (1990).
- Star Trek: The Next Generation (1987) and Quantum Leap: A Leap for Lisa - June 25, 1957 (1992) both had a character named Commander Riker.
- Carolyn Seymour appeared in Star Trek: Voyager: Persistence of Vision (1995), Star Trek: Voyager: Cathexis (1995), Quantum Leap: A Portrait for Troian - February 7, 1971 (1989) and as Zoey the evil counterpart to Al in three episodes of Quantum Leap.