Sam Uley is the leader of the La Push pack. His father, Joshua Uley, abandoned him and his mother when he was very young. Before becoming a werewolf, he was romantically involved with Leah Clearwater, his high school sweetheart. His relationship with her started to fall apart after his transformation, because he was forbidden to tell Leah what he had become. Their relationship ended when Sam imprinted on Leah's second cousin, Emily, and went back on every promise he had ever made to Leah. According to Jacob, Sam feels guilty for betraying her and responsible for the bitter person Leah has become.He is deeply upset and hurt when Leah leaves to join Jacob's pack, and so sends Jared to ask her to come back by telling him to get on his knees and beg, to do anything to convince her to rejoin his pack; even calling her "Lee-Lee", Sam's nickname for her from when they were dating. When he phases, he is pure black and the largest wolf, until Breaking Dawn when it is noted that Jacob has grown taller than him. He is the pack Alpha, but not by blood; that role is Jacob's, but he allowed Sam to lead the pack until Breaking Dawn.As a wolf, Sam is described as having black fur. He is huge, but as quiet as a shadow, as tall as a horse but more muscular, dagger-like incisors. He has a grisly snarl and is very swift. As a human, Sam is described as having long, rounded muscles, a deep voice with an older face, copper skin, very tall, cropped, black hair, and brown eyes. As the other boys on the reservation became werewolves one by one, Sam took on the role of Alpha and led them through their change and helped them become accustomed to their new life. To outsiders, it seemed as if he had started a cult. When Jacob became a werewolf, it was Sam who gave him the injunction (an absolute command given by the Alpha) not to tell Bella. Once Bella figured out the truth, Sam accepted her help with the search for Victoria. In Breaking Dawn when Jacob tells the pack that Bella is having a baby, Sam declares that they have to kill the fetus, and Bella along with it, as a necessary casualty to protect the tribe. Jacob embraces the Alpha heritage in his blood and he, Seth and Leah Clearwater leave the pack so they can protect the Cullens. Sam concluded that if Bella was killed, Jacob would be so mad that he would lead both packs in attacking the child. This never happened: Jacob wanted to kill Renesmee, but imprinted on her once he saw her. Sam and his pack were left with no choice but to declare true peace with the Cullens. Sam and his pack later stood by the Cullens when the Volturi confronted them. After the incident, Sam and his pack returned to La Push.