Even is unfair to say that this ruined the series, Chris Carter, The X Files creator, always referenced 'The Moonlighting syndrome' as how you will destroy an excellent series by doing that the stars have a romance. This idea finished in the most exaggerated unresolved sexual tension ever in a series in the case of Mulder and Scully, that didn't consummated their relationship until at least maybe season 6th or 7th and didn't kiss properly on screen until the last episode of 8th. According to him everything was wrong since David and Maddie slept together and he never wanted to happen that to Scully and Mulder.
Brian Baker called me names. Preston Holt lied to me. Omar Gaus mocked me. I don't think I like men anymore.
David Addison: We still like you.
A few minutes of bloopers from previous episodes are shown between the closing credits of episode 5.5, "Shirts and Skins".