https://www.itwasathingontv.com/e/episode-333-three-s-a-crowd-1984/
When a character in a series is popular, networks want to ride that character's popularity as long as possible. When ABC cancelled Three's Company, the network retained Jack Tripper, but placed him in a new series with a new love...and her father. Hilarity tried to ensue.
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When a character (http://www.thetvratingsguide.com/2020/01/spinoff-stories-threes-company-article-i.html) in a series (https://books.google.com/books?id=iSfplRxL8gIC&pg=PA300&lpg=PA300&dq=three%27s+a+crowd+1984+john+ritter&source=bl&ots=gnmKzKZaTI&sig=ACfU3U2ckbBaAuRIJnX61R29iTJIWddqlQ&hl=en&sa=X&ved=2ahUKEwj1hZaqtuX_AhWUsjEKHSi7BuA4ZBDoAXoECAQQAw) is popular (http://theobscurityfactor.blogspot.com/2011/09/john-ritter-in-threes-crowd-1984.html), networks want to ride (https://www.reddit.com/r/television/comments/pmvok4/unpopular_opinion_i_really_liked_threes_a_crowd/) that character's popularity (https://www.threescompany.com/about/) as long as possible (https://www.imdb.com/title/tt0086816/). When ABC cancelled (https://www.lipstickalley.com/threads/should-jack-and-janet-have-gotten-married-at-the-end-of-threes-company.4588955/) Three's Company (https://forums.stevehoffman.tv/threads/threes-company-1977-to-1984.993241/page-7), the network (http://www.inthe80s.com/prim8485.shtml) retained (https://jacksonupperco.com/2015/07/29/when-three-became-a-crowd-a-look-at-the-last-threes-company-spin-off/) Jack Tripper (http://thelandofwhatever.blogspot.com/2015/09/what-mightve-been-threes-crowd-1984.html), but placed him (https://www.nytimes.com/1984/09/17/arts/tv-review-ritter-and-a-new-cast-on-three-s-a-crowd.html) in a (https://books.google.com/books?id=70szDAAAQBAJ&pg=PA169&lpg=PA169&dq=three%27s+a+crowd+1984+john+ritter&source=bl&ots=ssXKAlCWis&sig=ACfU3U2dsgV87bA35Exp1UTG92x-k8KG_w&hl=en&sa=X&ved=2ahUKEwi76biYtuX_AhX3fDABHey6Cb84WhDoAXoECAIQAw) new series (https://web.archive.org/web/20061031132809/http://www.jumptheshark.com/t/threesacrowd.htm) with a new love (https://www.mcall.com/1984/09/16/jack-trippers-unwedded-bliss-raises-critics-ire-feature/)...and her father. Hilarity tried to (https://www.google.com/search?q=datalounge+three%27s+a+crowd&sxsrf=APwXEdd5psn7ziZvNHvKzBBcpNdnOfjuRA%3A1687935946614&ei=ytubZOyLJbWlptQPpvy0oA0&oq=data&gs_lcp=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&sclient=gws-wiz-serp) ensue (https://en.wikipedia.org/wiki/Three%27s_a_Crowd).
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