Hey, thought I'd start a new thread with this theme. Maybe if you don't want to know all the casts of the finales, you might want to skip this as there could be spoiling information.

1) Abby Cunningham/Ewing/Sumner - Knots Landing

2) Fox Mulder - The X-Files

3) Roj Blake - Blakes 7

4) Lost - (in afterlife form) Shannon Rutherford, Ana Lucia Cortez, Boone Carlyle, Libby Smith

5) Rhoda Morgenstern and Phyllis Lindstrom - TMTMS

While it was an awful final, Ray, Sue Ellen, Kristin, Gary & Val showed up on the last Dallas.

Janice returned for the final episode of Head of the Class.

Richie Cunningham returned for the finale of "Happy Days" to attend Joanie and Chachi's wedding.

Eric Forman and Michael Kelso returned for the finale of "That '70s Show" to attend the big New Year's party at the Forman's.

Diane Chambers returned for the finale of "Cheers."

steve allen came back as a panelest for the final cbs ep of whats my line

Kathleen Beller (Kirby Anders) returned for the 1991 Dynasty-The Reunion, which was as close to being a finale (it aired two years after the series ended without a conclusion) as that series saw. She left the series in 1984. Also in this show Al Corley returned to the role of Steven Carrington, a role he played in the first two seasons of the show. This rendered meaningless the plot device of Steven's plastic surgery following an oil rig explosion to explain Al's replacement by actor Jack Coleman.

Tasha Yar - Star Trek: The Next Generation

On the last episode of Seinfeld they brought back almost every memborable character that appeared in the series. Though it was probably my least favorite episode.