that she has been killing to help her sick son. As Sam experiences hallucinations of Lucifer taunting him with the idea that he is still in Hell, he initially tries to control them by focusing on wounds he sustains in the real world, but matters become worse when he is forced to rely on information from the hallucination to save Dean. As his mental state becomes worse, Sam foregoes sleep to stop his visions, but is sent to an asylum when he is hit by a car while running away from Lucifer. While trying to find a healer who may be able to repair Sam, Dean encounters an amnesiac Castiel, who, when restored to his full powers, sacrifices himself by taking Sam's mental damage. Sam is shown to possess great guilt about this and rejects hope that Bobby's ghost may be helping them out after an attempt to communicate with him fails. Sam is initially happy when it is shown that Bobby's ghost is there helping them, but changes his mind after Bobby shows more and more signs of becoming a vengeful spirit. During the final battle at Sucrocorp, Sam rescues Kevin Tran – a Prophet who can read the Word of God – and is horrified to hear of Dick Roman's plan to kill all the skinny people in the world through poison in their coffee creamers. He and Kevin head to the lab where they find Dick Roman being killed by Dean and Castiel. After Dick explodes, Dean and Castiel disappear and Crowley appears and takes Kevin, leaving Sam completely on his own, not knowing Dean and Castiel are now trapped in Purgatory. Season 8 The year Sam spends while Dean and Castiel are trapped in Purgatory is revealed through various flashbacks in the first half of the season. Now left on his own, Sam believes that Dean had been killed when Dick exploded, and gives up hunting. After several months, he accidentally runs over a stray dog and, panicked, takes it to an animal hospital. The veterinarian who saves the dog's life – Amelia Richardson – convinces Sam to take responsibility for the stray by adopting it. Despite a rocky start, Sam and Amelia fall in love and even buy a house together in Kermit, Texas. They later find out that her husband Don, who she had believed was killed in action, was actually still alive. Sam