In the ashes of the Civil War, two battered gunslingers-one Union, one Confederate, chase a gang into a ghost town with a blood-soaked past. But it ain't just outlaws lurking in Purgatory. Something ancient. Something evil. And it wants revenge. Saddle up, sinner-this ride is going straight to hell.

Set in the '50s in a movie theatre showing a serial called "Space Patrol," this particular episode being "Back from the Future." The evil scientist on the serial goes back to the '50s and his crew members have to chase him. Meanwhile at the theatre, patrons busy themselves doing strange things. An alien has landed and is eliminating theatre staff and patrons.