Someone brought up The Muppets. If we started counting all the shows The Muppets appeared “in character” doing interviews, we probably talking about dozens of different talk and news shows.
Seems like I remember TV Characters taking a cruise on the Pacific Princess (The Love Boat), but I can’t remember who they might be.
I doubt it qualifies, but Tim Daly appeared as himself on an episode of “Monk.” Several references were made to the show “Wings,” but Adrian Monk couldn’t place the show (both Tim Daly and Tony Shaloub - who plays Monk - were on “Wings” together).
Several of the St Elsewhere doctors (Craig and Westphal, I think) appeared on an episode of Cheers.
Actually, they went to the pub “Cheers” within a St. Elsewhere episode. And this doesn’t qualify for the thread since both shows were on the air.
Worf arrived on DS9 several years after TNG went off the air. He was also in the TNG movies.
Michael Dorn spent a lot of years wearing the prosthetic makeup.
At that, a three-part episode of The Jeffersons had George get himself into a contrived need-to-scam-the-scammers scenario, and in guy-who-knows-a-guy fashion lines up help from Jimmy’s cousin: the gag is, saying “Jimmy’s cousin” means a name never has to get mentioned while Greg Morris is doing his Barney Collier act by rigging up an elaborate con involving a faked TV broadcast and et cetera.
I am not sure if this qualifies exactly since the show names are the same but Mark Hamill played the Trickster in both the 1991 Flash series and more recently in the 2015 Flash series. Of course, he has voiced the Joker since first doing so in Batman: The Animated Series in subsequent non-concurrent animated series and films.
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Another crossover from Star Trek OS to TNG: Sarek.
Thought of another one. Batman Beyond (Terry McGinnis, the future Batman) appeared in an episode of Justice League Unlimited in an episode named Epilogue that would have made for a great finale for the DCAU. The finale scene is an homage to the very first scene of the first episode of Batman TAS.
Mandy Patinkin made a brief cameo as his Chicago Hope character in an episode of Homicide:Life on the Streets
Not the same actor, but the first episode of 704 Hauser (spin-off of All in the Family about a black family living in the Bunker house) featured a cameo by Joey Stivic, Gloria and Meathead’s son.
The Beatles had their own Saturday morning animated series, and later George, Paul and Ringo would appear in three different episodes of The Simpsons.
Although original Beatles recordings were played on the animated series, the Beatles didn’t play themselves. Voice actors did the dialog in the episodes. Paul Frees (famous for playing Boris Badenov in Rocky and Bullwinkle cartoons) played John and George.
Another one I just remembered. Chi McBride played principal Steven Harper on David E. Kelley’s Boston Public, which ended its run in 2004.
In 2005, Harper was a defendant in a trial on Davin E. Kelley’s Boston Legal.
Buddy Ebsen played Jed Clampett on “The Beverly Hillbillies”. He later starred in “Barnaby Jones”. When they made the Beverly Hillbillies movie, starring Jim Varney as Jed Clampett, Buddy Ebsen had a cameo in that movie as Barnaby Jones.
That was true of Yellow Submarine, too, which IIRC was done by the same company. But they did it in a completely different, Peter Max-y style. The Beatles refused to voice themselves (it was a different team of voice actors than the Saturday morning stuff), but when they saw the final result they agreed that it was much better than they’d feared, and they agreed to appear in a brief post-cartoon scene.
Ed Asner played smuggler August March on an episode of the original Hawaii 5-0. He ended up being caught and sent to prison for thirty years.
On the reboot of Hawaii 5-O, Asner played August March as an old man, finally getting out of prison, and helping the cops catch a new generation of smugglers.
It wasn’t a TV show, but a movie and a TV show.
The “The Days Dwindle Down” episode of Murder, She Wrote (broadcast April 19, 1987) featured Jeffry Lynn, Martha Scott, and Harry Morgan (Colonel Potter from MASH) reprising the roles they’d played in the 1949 movie Strange Bargain, which was used for “flashback” scenes.
Katherine Emery had died in the intervening years, so her part was taken by a pre-Titanic Gloria Stuart.
I saw that one. It was a good episode, but weird. Pulling the two versions into the same universe doesn’t make a whole lot of sense.
Neil Patrick Harris appeared as Doogie Howser on Roseanne