The X Files - All Flashbacks in Demons (4x23)

If you think Mulder was harsh here, wait until you see what Scully makes him do next episode!
Demons is Season 4 Episode 23 of The X Files.
Directed by:
Kim Manners
Written by:
R. W. Goodwin (normally a producer and director, this is his first, and only, writing credit for the show)

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After a forced experiment, Mulder sees some of his memories in hope to find the truth about his sister, involving a tense conversation between his father and a young Smoking Man.
The "Demons" from his past are catching him.