Two troubled men face their terrible destinies and events of their past as they join together on a mission to find the Holy Grail and thus to save themselves.
When an alien takes the form of a young widow's husband and asks her to drive him from Wisconsin to Arizona, the government tries to stop them.
Four unwitting heroes cross paths on their journey to the sleepy town of Silverado. Little do they know the town where their family and friends reside has been taken over by a corrupt sheriff and a murderous posse. It's up to the sharp-shooting foursome to save the day, but first they have to break each other out of jail, and learn who their real friends are.
