Marina Sirtis, Armin Shimerman, and Tim Russ have each starred in each of the 1990s Star Trek series as Counselor Deanna Troi in Star Trek: La nouvelle génération (1987), Quark in Star Trek: Deep Space Nine (1993) and Lt. Commander Tuvok in Star Trek: Voyager (1995), respectively. Meanwhile, Hana Hatae and Manu Intiraymi played recurring characters Molly O'Brien on TNG and DS9, and Icheb on Voyager, respectively. Later, Doug Jones would also star as Commander Saru in the 2017 prequel series Star Trek: Discovery (2017).
Reunites actors Armin Shimerman and Doug Jones, who have both played recurring roles on Buffy contre les vampires (1997): Shimerman played Principal Snyder from seasons one to three, with brief reappearances, while Jones played a Gentlemen in season four's Hush (1999).