It is October 30, 1977 and two couples are on a road trip for their book. They soon run out of gas and have to go to a place called Captain Spaulding's Museum of Monsters and Madmen. There they get gas and meet the crazy Captain Spaulding. He takes them on a theme park ride, called the murder ride, where he tells them the story of Dr. Satan. After the ride is over, they decide to try and find the tree where Dr. Satan was hung, so they get Captain Spaulding to write them a map to where it was. Soon they pick up a hitchhiker since it's pouring down rain. While they are driving her to her home, their car breaks down and they are forced to stay at her place for the night. Little do they know that her family is planning a huge Halloween party, where these two couples are the guests of honor.
The movie opens with us being introduced to Captain Spaulding and his co-worker. Two robbers break in and pull a gun to Captain Spaulding and his co-worker's heads. Captain Spaulding dares them to attack him and soon ends up killing both of the robbers. ...