A flying saucer lands in the backyard of an elderly suburbanite with memory problems, who forms a bond with the scared alien inside.

On a dark and somber night, a secret cabal of monster hunters emerge from the shadows and gather at the foreboding Bloodstone Temple following the death of their leader. In a strange and macabre memorial to the leader’s life, the attendees are thrust into a mysterious and deadly competition for a powerful relic—a hunt that will ultimately bring them face to face with a dangerous monster.

Leonard Shelby is tracking down the man who raped and murdered his wife. The difficulty, however, of locating his wife’s killer is compounded by the fact that he suffers from a rare, untreatable form of memory loss. Although he can recall details of life before his accident, Leonard cannot remember what happened fifteen minutes ago, where he’s going, or why.

A sheriff’s deputy fights an alternate universe version of himself who grows stronger with each alternate self he kills.