A former U.S. soldier returns to his hometown to find it overrun by crime and corruption, which prompts him to clean house.

S. Darko follows Samantha Darko, the younger sister of Donnie, the protagonist of Donnie Darko, and her friend Corey. On their way to California, their car breaks down, forcing them to wait in a small town until it is fixed. While there, Samantha begins to have dreams that warn her of the end of the universe.