Pre-canon
Season One
Season Two
Season Three
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[Fic] The Patron Saint of Liars and Fakes. Sark's not the only one good at deceit. (3X13: After Six)
Season Four
Season Five
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[Fic] Gotta Plan For the Something Wonderful. In which Olya doesn't take kindly to Sark's latest affair. (5X08: Bob)
Post-canon