He's basically Ash's personal half-deadite/ half midget trash-talking side-kick. He used to be an inmate of the Sunnyside Mental Institution, where Ashley J Williams was staying after the events of Evil Dead II. He was admitted due to an extreme case of ADD (Attention Deffiecet Disorder). Dr. Reinheart used Sam in his experiments with the Necronomicon Ex-Mortis to raise someone from the dead without them being possessed by a Kandarian Spirit (Sam was the only sucessful subject). He's also a major germaphobic.
Through out the game, Sam will start random conversations with Ash (ei. Do you think of me as your best friend?) After defeating "Sparky" (a deadite that possessed electric powers), Ash meets Sam during a conversation with the spirit of Professor Knowby. Things start out bad between these two, but Ash eventully befriends him. Both he and Ash were sucked into a portal after defeating Dr. Reinhear (who turned into a troll-like monster).
Sam has several abilities that are unique to Deadites
After being killed in any way at all, Sam will crawl through a magic portal in the ground good as new. Well, sort of.
Magic Projectiles Edit
Sam can fire glowing purple-ish blue from his hands. These projectiles can kill small enemies (such as rat like deadites) and stun larger ones.
Ash can kick Sam at enemies, attacking as a distracion. There are three ways this can be done.
Normal Punt: Ash kicks Sam at a deadite or anyother target. If it's a deadite, Sam will hold onto it and giving Ash a chance to kill it. If it's a different target, Sam will surffer a cruel death to (usually) clear the way in our heros journy.
Charged Punt: Sam is charged with Deadite energy and explodes, like a bomb. This can be only used after Ash has unlocked "Bad-Ash" form.
Fiery-Punt: Ash can set Sam on fire (usually with his flamethrower hand) and kick him. This can be used to set other Deadites on fire.
Ash can take control of Sam, forcing him to go through areas that Ash couldn't (and often where Sam doesn't want to go.) If Sam is killed in this form, the player will have to start all the way from the beginning. Sam can also be used to take control of a huge brute deadite to smash away an obstacle.