Sam Winchester is different... very different. Though he's human, he has amazing telekinetic abilities, and his brother is a Cursed One. Sam and his brother lived for years with only each other, and there was no one Sam trusted more in the world.
Then a human found them in their hiding spot one night and killed his brother while he watched. Sam was able to kill the villain, but not before his beloved brother was dead.
Now Sam lives alone, waiting for his ability to gain strength so he can take his revenge. He only trusts other Cursed Ones, and hates everyone else because they caused his brother's death. He's bitter, he's alone... and he's ready to kill.