When: August-October

This hook-up was never confirmed, but was heavily speculated. After she split with her partner of six years, Mark Griffiths, Gillian began talking to the press about her bisexuality. While that information might lead one to believe that Gillian may have her sights set on a lady, many speculated that those comments were actually made to throw the media off the trail of whom she's really dating, her former X-Files co-star, David Duchovny. In fact, some sources even stated that the 44-year-old actress even moved her two children in with the 52-year-old Californication star. 

If it were to come out that Mulder was dating Scully, nerds all over the world would lose their collective minds.