Watching an episode of Frasier followed by watching the TNG episode Cause and Effect with Kelsey Grammer as Captain Morgan Bateson got me to thinking. What TV show has had the most actors appear on any of the Star Trek movies and/or TV series?
To make this a bit easier I would like to only count TV shows in which a recurring starring cast member appears on Star Trek. E.g. in the sitcom Big Bang theory we have Wil Wheaton, Levar Burton, Brent Spiner & Leonard Nimoy (voice only) all in Star Trek. However only Wil Wheaton would be considered a regular starring role with 13 appearances and Wikipedia specifically referring to it as a recurring role. Otherwise shows which simply have the same guest star popping between that show (e.g. 1 or 2 episodes) and Star Trek is not what I am seeking.
From the following site which lists famous celebrities whom have appeared on Star Trek I can see at least two shows that have three actors each and two more with two.
Cheers : The aforementioned Kelsey Grammer, Bebe Neuwirth as the nurse in TNG First Contact and Kirstie Alley as Lt. Saavik in TWOK.
Frasier : Again the aforementioned Kelsey Grammer, Bebe Neuwirth as the nurse in TNG First Contact and Saul Rubinek in TNG The Most Toys.
Lost : Daniel Dae Kim as Corporal Chang in Enterprise (Hatchery, Extinction & Th Xindi) and Astronaut Gotana-Retz in Voyager Blink of an Eye & Terry O'Quinn as Admiral Eric Pressman in TNG The Pegasus
Quantum Leap : Scott Bakula as Captain Archer in Enterprise and Dean Stockwell in Colonel Grat in Enterprise Detained