He can appear evil at times, especially when he is hooked on demon's blood, but Sam is never evil. Even the power he gains while on demon's blood is used to defeat more powerful demons such as Alistair, and Lilith, and he uses it again in season five to defeat Famine.
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Sam and Dean Winchester.
Sam Winchester is played by Jared Padalecki.
Their last names are Winchester.
Sam and Dean's father is named John Winchester.
Nope Sam gets him out of it! :P