Surprising everyone by revealing that Mulder actually had a long-term girlfriend at one point, Diana Fowley showed up in the fifth season finale of The X-Files, taking over the cases when Mulder and Scully were kicked out of the department. Not only had she and Mulder dated, but Fowley had really been on board with all of his crazy theories, helping him discover and reopen the X-Files before doing what most of us would do and peacing out on Mulder the second her job bought her a ticket to Europe.

As with most things in The X-Files, Fowley was a riddle wrapped in a puzzle tied up in a conundrum that was probably a conspiracy the whole time. It was implied that she might have been working with the Syndicate, one of the shady governmental organizations dead set on messing with Mulder's head and discrediting him. I'm all for messing with Mulder's head, but the Syndicate is actually kind of bad at it. It takes them several seasons to really discredit Mulder, and they make it look a lot harder than it would be.

You know who super didn't like Fowley, though? Scully. Even from the beginning, Scully is disgruntled by Mulder deferring to Fowley. It's understandable, Fowley was taller than Scully, so naturally Scully felt threatened by her presence. UGH. It is a tried and tired trope, after all, that women must be forever threatened by each other above all other emotions. For her part, Fowley mostly scoffed at Scully and ignored her most of the time, which is unfortunate because their bizarrely similar sounding names make me wish they had their own spin-off together.

In the end, though, Fowley and Mulder did have something resembling chemistry going on between them. While Mulder's connection with Scully was always that of a heartfelt soulmate, Fowley ran hot and cold, alternately flirting with him and delivering underhanded quips. On the other hand, poor Fowley really didn't get much time in the spotlight before Scully eventually announces that she was found dead. Gee, that sure sounds like a convenient way to wrap things up.