Beside the fight against Lucifer and Lilith, 'Supernatural' season finale on May 14 will show the internal rift between Sam and Dean.
A big portion of the season finale of "Supernatural" has been given through a three-minute clip. Consisting of three different scenes, the sneak peek lacks of the anticipated action but provides the dilemma experienced by each of the Winchester brothers.
In the first clip, Sam talks to Ruby on his decision to go against Dean. In the second clip meanwhile, Dean complains about Sam's attitude to Bobby and got yelled at for being soft. The third and last clip shows Castiel and Zachary approaching Dean for a strategy to kill Lilith.
The fourth season finale airs Thursday, May 14. The official synopsis is read: "The apocalypse is coming, and Sam and Dean prepare for the fight in very different ways. Sam joins Ruby on a final run to kill Lilith (guest star Katherine Boecher), while Castiel and Zachariah (guest star Kurt Fuller) tell Dean it's time to play his part in stopping Lucifer."