|Dates||???? - 2012 (killed by Castiel)|
|Location||Northern Indiana State Hospital|
|Episode(s)||7.17 The Born-Again Identity|
Marcus is the orderly working at Northern Indiana State Hospital's locked psychiatric ward, where Sam is held after he is diagnosed with suffering from a psychotic episode. Marcus becomes possessed by an unnamed demon who seeks to harm Sam while he is vulnerable.
Marcus brings Sam food and asks how he is doing. He isn't allowed to give Sam much information about Marin when Sam asks, but does pass on that she 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. He is impressed by Sam's pain threshold, but remains determined to give Sam brain-damage by "frying" his brain and decides to amp up the electrical charge. At that moment, Castiel appears and smites the demon, killing Marcus but saving Sam.