Arrow has nabbed an X-Files alum who’ll play a huge role in changing the life of a Queen family member.

Nicholas Lea, who played Mulder and Scully’s longtime nemesis Krycek, will guest-star on The CW’s sophomore hit, TVLine has learned exclusively.

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The actor will appear in Episodes 12 and 13 as Mark Francis, Walter Steele’s close associate. Francis will have a crucial part in the surprising twist that Moira’s life will take after her murder trial.

Lea’s other TV credits include a guest spot as infamous G-man Eliot Ness on Supernatural, as well as roles on Continuum, The Killing, V, Kyle XY and Men in Trees.