Warner Bros. has acquired rights for The Days Before, a sci-fi action spec script by Chad St. John, and set up the project with Gianni Nunnari (300) at his Hollywood Gang shingle, according to Variety.

The story centers on aliens invading Earth by traveling backwards through time and wiping out humanity -- yesterday by yesterday -- while one man stays a yesterday ahead of them, trying to convince the world that the end is coming again.

No production date was set.