Of course, there was the infamous final episode of Enterprise, with Jonathan Frakes and Marina Sirtis reprising their Will and Deanna characters with a voice cameo by Brent (Data) Spiner.
I haven’t seen mention above of the Ally McBeal/The Practice crossover, with characters from each show appearing on the other.
http://www.poobala.com/allyandpractice.html
Actually, that page is hosted by a site that is extremely relevant to this thread:
And, in another (and incredibly ridiculous) apearance as Colonel Klink, Werner Klemperer appeared on the 1960s Batman, talking to the “wall climbing” Batman:
http://www.poobala.com/batmanandhogan.html
Thank Og I never saw this.
Way back in Post #6.
O’Brien was never a regular on TNG; he was a recurring guest. He was a regular on DS9, though. Worf was a regular on both (DS9 seasons 4-7).
Richard Grieco was Dennis Booker on 21 Jump Street and the short lived spin-off Booker.
Robert Knepper played Theodore “T-Bag” Bagwell on Prison Break. He then reprised that role for an episode of Breakout Kings
The two series have the same creators but is not really a spin-off.
Harry Morgan played Pete Porter on December Bride and its spinoff Pete and Gladys.
You might say that Majel Barret played the Computer in both TOS and TNG, but I guess one could argue it wasn’t the same computer. You can get into deep philosophical discussions about this.
JD Hogg was Flo’s uncle or something.
I hate you!:mad: I just spent the last 3 hours there. ;):D:p
She played the computer in TOS? It sounds nothing like the computer of TNG-DS9-Voy. Not saying you’re wrong, just I’ve never heard that it was her before.