1x15: Watch X-files

: Mulder's theory is bolstered by subtle changes: the previously right-handed Willis begins using his left hand (Dupre's dominant hand), forgets Scully’s birthday (which he normally shares), and develops a sudden tattoo that mimics Dupre's.

: Agent Jack Willis —Scully's former boyfriend—and Agent Dana Scully conduct a stakeout at a bank expecting a robbery by a pair of married outlaws, Warren Dupre and Lula Phillips . Watch X-Files 1x15

: At the hospital, Willis flatlines for several minutes while Dupre is simultaneously declared dead. Just as Dupre's life ends, Willis is miraculously revived, leading Mulder to suspect that Dupre's consciousness has possessed Willis's body. : Mulder's theory is bolstered by subtle changes:

: A "Monster-of-the-Week" standalone story, independent of the main alien conspiracy mythology. Where to Watch Willis is miraculously revived