Supernatural: The Anime Series (2011)

S1E7 Temptation of the Demon

Sam and Dean reconnect with their longtime ally, Bobby, as they search for leads on their father, John. Their investigation takes a dark turn when they discover that a former comrade from John's time in the Marines has been killed under mysterious circumstances. The brothers delve deeper into the case, uncovering unsettling truths that could bring them closer to finding John or lead them into dangerous territory.