“The X-Files” finally showed Agents Mulder and Scully kissing in the Season 7 episode “Millennium”, ending a six-year pattern of romantic teasing. However, the moment frustrated many viewers because it appeared without meaningful discussion and occurred during an awkward crossover intended to conclude the cancelled series “Millennium”.

The episode, which aired on 28 November 1999 as the show’s 143rd instalment, diverted from its main conspiracy storyline to feature former FBI agent Frank Black. Set around New Year’s Eve and the Y2K panic, it ended with Mulder and Scully kissing in a hospital while watching the midnight celebrations, but the relationship remained largely unexplained; a later episode similarly implied they had slept together without addressing it directly.