"Southland Tales" is an ensemble piece set in the futuristic landscape of Los Angeles on July 4, 2008, as it stands on the brink of social, economic and environmental disaster. Johnson will star as Boxer Santaros, an action star stricken with amnesia whose life intertwines with Krysta Now (Gellar), an adult film star developing her own reality television project, and David Clark (Scott), a Hermosa Beach police officer who holds the key to a vast conspiracy.