Heretic

A rich art collector buys a stolen painting from a thief. The painting portrays a man before the Spanish Inquisition. The collector, Harte, is soon visited by a mysterious man who begs him to repent of his sins and give up the wrongfully-gained picture. Harte ignores the warnings and finds himself sucked into the painting where he is to be tortured as a sinner and heretic. He recants to the Inquisitor, who lets him go. Once out of the painting, Harte refuses to give it up, and receives a personal visit from the Inquisitor in the real world. The thief returns to take the picture, and Harte is nowhere to be found...in this world.

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S03E08 - A Serpent's Tooth