|Location||Northern Indiana State Hospital|
|Episode(s)||7.17 The Born-Again Identity|
Marcus is the orderly working on the locked psychiatric ward in which Sam is held after he is diagnosed with suffering from a psychotic episode. He tells Sam that Marin isn't in hospital as the result of an accident. He later wheels Sam to a room and connects him to an electroshock therapy machine. He begins to torture Sam and it is revealed that Marcus is possessed by a demon. Castiel appears and smites the demon, killing Marcus and saving Sam.