Three's a Crowd was obviously, meant to be her big break as an actress. According to her filmography (https://en.wikipedia.org/wiki/Mary_Cadorette#Filmography), before she was cast (https://www.sitcomsonline.com/boards/showpost.php?p=6175058&postcount=24) in the role of Vicky Bradford for the final few episodes (https://jacksonupperco.com/2015/07/28/the-ten-best-threes-company-episodes-of-season-eight/) of Three's Company (https://www.lipstickalley.com/threads/should-jack-and-janet-have-gotten-married-at-the-end-of-threes-company.4588955/) leading into (https://www.sitcomsonline.com/boards/showpost.php?p=6176915&postcount=26) Three's a Crowd (https://jacksonupperco.com/2015/07/29/when-three-became-a-crowd-a-look-at-the-last-threes-company-spin-off/), she only had one other credited on-screen role. That being as "Dancer" in 1980's Those Lips, Those Eyes (https://www.imdb.com/title/tt0081625/reference/).

But after Three's a Crowd (https://web.archive.org/web/20061031125202/http://www.jumptheshark.com/t/threesacrowd.htm)'s one and done season in 1984-85, Mary Cadorette (https://www.google.com/search?q=recent+datalounge+Mary+Cadorette&sxsrf=AB5stBjo1OHOrkwrdgSAQOz4HNnLCXch8w%3A1688625382663&ei=5mCmZNGOKMLfkvQPnMWDkAo&ved=0ahUKEwjRmd7gu_n_AhXCr4QIHZziAKIQ4dUDCBA&uact=5&oq=recent+datalounge+Mary+Cadorette&gs_lcp=Cgxnd3Mtd2l6LXNlcnAQAzIFCCEQoAE6BwgjEOoCECc6FQgAEAMQjwEQ6gIQtAIQjAMQ5QIYAToVCC4QAxCPARDqAhC0AhCMAxDlAhgBOgQIIxAnOhAIABCABBAUEIcCELEDEIMBOgcIABCKBRBDOgsIABCABBCxAxDJAzoICAAQigUQkgM6CAgAEIAEEJIDOgUIABCABDoOCAAQgAQQsQMQgwEQyQM6CAgAEIAEELEDOgcIABCABBAKOgYIABAWEB46CAgAEIoFEIYDOgUIIRCrAkoFCDwSATFKBAhBGABQAFitL2CHMWgCcAB4AIABmwOIAdctkgEKMC4xOS45LjAuMZgBAKABAbABFMABAdoBBggBEAEYCw&sclient=gws-wiz-serp) never got (https://www.reddit.com/r/80s/comments/bxd54y/comment/eqfzho0/?utm_source=reddit&utm_medium=web2x&context=3) another leading/main role. Much of her subsequent acting work was made up of walk-on, one-off (https://nedhardy.com/2022/04/13/mary-cadorette/) guest appearances. Her highest profile acting gig post-Three's a Crowd was probably a four episode arc as Judge Harry Stone's newspaper reporter love interest Margaret Turner on Night Court (https://screenrant.com/night-court-best-worst-relationships/) in that show (https://web.archive.org/web/20061031125344/http://www.jumptheshark.com/n/nightcourt.htm)'s eighth season (https://jacksonupperco.com/2016/07/05/the-seven-best-night-court-episodes-of-season-eight/).

Mary (https://www.youtube.com/watch?v=QB_nhehEby0)'s last acting gig was in the year 2000, when she appeared on Beyond Belief: Fact or Fiction (https://en.wikipedia.org/wiki/Beyond_Belief:_Fact_or_Fiction).

I don't think it was the failure of Three's a Crowd, but unfortunately a reflection of her true acting skills.

The short answer to the question is no, Mary's career was not hurt by the failure of Three's a Crowd. She was miscast in the part, she was in way over her head and that is squarely on the producers and a star who had much too much input into the casting decision. John had taken over Three's Company by the end of season 5, his character was the entire focus of the series. The follow-up show was going to have to be something different with the developing relationship being the core of the series. Rather than doing that, the show replaced brunette Janet/blond Janet with a live-in girlfriend, a landlord with a would be father-in-law and John once again the center of all attention. The show was a slightly reworked version of the first series with nothing new to offer, the audience's tepid reaction to the show should have surprised no one.

I believe I've heard before she was cast in Three's A Crowd that Mary Cadorette had mostly been a Broadway actress. So I just assumed (In my defense I was only a teenager at the time LOL) that when the show was cancelled she went back to acting on Broadway and decided that television wasn't for her. Does anybody know if she ever said she wanted to have more of an acting career in TV than on the stage? Just wondering.

Ed.