TV Tropes has a category on this called Retroactive Recognition (https://tvtropes.org/pmwiki/pmwiki.php/Main/RetroactiveRecognition).

*A pre-Full House Candace Cameron (https://web.archive.org/web/20140407134730/http://forums.televisionwithoutpity.com/topic/2874131-whos-the-boss/page-9#entry13242530) as a young version of Mona.

*A pre-Designing Women Delta Burke as next door neighbor Diane Wilmington (later recast with Tony Danza's old Taxi co-star Marilu Henner).

*Jeri Ryan (AKA Seven-of-Nine on Star Trek) as a lifeguard in the "Unsinkable Tony Micelli" episode from Season 7.

*Halle Berry in the formal Living Dolls pilot (Vivica A. Fox played her character in the original pilot that didn't air until Who's the Boss? reached syndication). Speaking of Living Dolls, Leah Remini as Samantha's old friend from Brooklyn, Charlie Briscoe.

*A pre-Friends Matthew Perry (https://www.the-back-row.com/blog/2012/11/12/before-they-were-stars-matthew-perry-on-whos-the-boss/) as Sam's college roommate, Benjamin in Season 7.

*A pre-Nanny Fran Drescher in the attempted "Charmed Lives" (http://www.thetvratingsguide.com/2020/02/abc-endured-some-troubled-waters-until.html) spin-off (http://www.poobala.com/charmedandwhos.html).

Marcia Cross (https://tvtropes.org/pmwiki/pmwiki.php/Creator/MarciaCross) AKA Kimberly Shaw (https://melroseplace.fandom.com/wiki/Kimberly_Shaw) on Melrose Place and Bree Van de Kamp (https://en.wikipedia.org/wiki/Bree_Van_de_Kamp) on Desperate Housewives in the "Mother and Child Disunion" (https://www.imdb.com/title/tt0747787/) episode:
MUwBJEUYSeI

TV Tropes has a category on this called Retroactive Recognition (https://tvtropes.org/pmwiki/pmwiki.php/Main/RetroactiveRecognition).

*A pre-Full House Candace Cameron (https://web.archive.org/web/20140407134730/http://forums.televisionwithoutpity.com/topic/2874131-whos-the-boss/page-9#entry13242530) as a young version of Mona.

*A pre-Designing Women Delta Burke as next door neighbor Diane Wilmington (later recast with Tony Danza's old Taxi co-star Marilu Henner).

*Jeri Ryan (AKA Seven-of-Nine on Star Trek) as a lifeguard in the "Unsinkable Tony Micelli" episode from Season 7.

*Halle Berry in the formal Living Dolls pilot (Vivica A. Fox played her character in the original pilot that didn't air until Who's the Boss? reached syndication). Speaking of Living Dolls, Leah Remini as Samantha's old friend from Brooklyn, Charlie Briscoe.

*A pre-Friends Matthew Perry (https://www.the-back-row.com/blog/2012/11/12/before-they-were-stars-matthew-perry-on-whos-the-boss/) as Sam's college roommate, Benjamin in Season 7.

*A pre-Nanny Fran Drescher in the attempted "Charmed Lives" (http://www.thetvratingsguide.com/2020/02/abc-endured-some-troubled-waters-until.html) spin-off (http://www.poobala.com/charmedandwhos.html).

Only on a recent re-watch did I remember Matthew Perry was on the show for that one episode. I love seeing things like this because I imagine how he was essentially a bit player/nobody on set that day, but a few years later he's on a top 3 show on NBC. Literally everyone on WTB would've wished they were on Friends just a few years later.

Only on a recent re-watch did I remember Matthew Perry was on the show for that one episode. I love seeing things like this because I imagine how he was essentially a bit player/nobody on set that day, but a few years later he's on a top 3 show on NBC. Literally everyone on WTB would've wished they were on Friends just a few years later.

That just reminds me:
4o2u2RjEFHo :lol:

Only on a recent re-watch did I remember Matthew Perry was on the show for that one episode. I love seeing things like this because I imagine how he was essentially a bit player/nobody on set that day, but a few years later he's on a top 3 show on NBC. Literally everyone on WTB would've wished they were on Friends just a few years later.

Matthew Perry had incidentally, previously worked with Tony Danza in the film She's Out of Control (https://www.youtube.com/watch?v=xZYSAoL1tQc).

Marcia Cross (https://tvtropes.org/pmwiki/pmwiki.php/Creator/MarciaCross) AKA Kimberly Shaw (https://melroseplace.fandom.com/wiki/Kimberly_Shaw) on Melrose Place and Bree Van de Kamp (https://en.wikipedia.org/wiki/Bree_Van_de_Kamp) on Desperate Housewives in the "Mother and Child Disunion" (https://www.imdb.com/title/tt0747787/) episode:
MUwBJEUYSeI

A pre-Frasier Jane Leeves as Billy's school teacher in the "Parental Guidance Suggested" (https://www.imdb.com/title/tt0747799/) episode from Season 7.