An American village is visited by some unknown life form which leaves the women of the village pregnant. Nine months later, the babies are born, and they all look normal, but it doesn't take the "parents" long to realize that the kids are not human or humane.
Ash is transported back to medieval days, where he is captured by the dreaded Lord Arthur. Aided by the deadly chainsaw that has become his only friend, Ash is sent on a perilous mission to recover the Book of the Dead, a powerful tome that gives its owner the power to summon an army of ghouls.
Bumbling Ernest P. Worrell is assigned to jury duty, where a crooked lawyer notices a resemblance with crime boss Mr. Nash, and arranges a switch. Nash assumes Ernest's job as a bank employee, while Ernest undergoes Nash's sentence to the electric chair. But instead of killing him, the electrocution gives Ernest superhuman powers, enabling him to escape from jail and foil Nash's attempt to rob the bank.