"Ghouli" is the fifth episode of the eleventh season of The X-Files. It is written and directed by James Wong.
When a pair of teenage girls attack one another, each believing the other to be a monster, Mulder and Scully find that their investigation could possibly lead back to their long-lost son, William.
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- David Duchovny as Special Agent Fox Mulder
- Gillian Anderson as Special Agent Dana Scully
- Mitch Pileggi as Assistant Director Walter Skinner
- William B. Davis as Cigarette Smoking Man
- Miles Robbins as Jackson Van De Kamp/William Mulder
- Sarah Jeffery as Brianna Stapleton
- Madeleine Arthur as Sarah Arthur
- Louis Ferreira as Detective Costa