Born May 2, 1983, the same birthdate as Eric Kripke's son.
Son of John & Mary Winchester; younger brother of Dean Winchester and older half-brother of Adam Milligan
Castiel sticks his right arm into Sam's chest and reveals to Dean that, the reason for Sam's cold/relentless behavior is because his soul is missing because of him being in hell.
It is revealed that Sam, with the aid of the Impala which resurfaced certain powerful memories, could in fact resist Lucifer; thanks to the Impala, one of his memories were triggered which allowed him to regain control of his body.
Surprisingly enough, despite the weighting odds, Sam manages to absorb the memories of his experiences in Lucifer's Cage, and was able to resist them from decimating him.
Sam dies in 2.21 All Hell Breaks Loose: Part One after being literally and figuratively backstabbed by Jake Talley. He is resurrected in 2.22 All Hell Breaks Loose: Part Two after Dean makes a deal with a crossroads demon.
Sam dies of a lightning strike induced by a wish from Hope Lynn Casey, reversed moments later along with all the other wishing-well wishes.
Sam dies of asphyxia after Zachariah removes his lungs, reversed moments later at Castiel's order.
Sam dies when Anna stabs him in the gut, reversed a few minutes later by Michael.
Sam dies when angry hunters shoot both him and Dean for Sam's role in starting the Apocalypse.
Samuel "Sam" Winchester is a hunter who hunts supernatural creatures with his older brother Dean Winchester. He is called "Sammy" by those closest to him.
Sam is the son of Mary and John Winchester, has a half-brother named Adam Milligan, and was the true vessel for Lucifer.
He and Dean come from a family of hunters on their mother's side, but this fact was unknown to them for some time. Sam was named after his maternal grandfather, Samuel Campbell. His grandmother is Deanna Campbell