Cartman begins to wonder why all the kids at school have fathers but him. When he asks his mother who his real father is, she tells him about the night of the drunken barn dance, when he was conceived. Unfortunately, Mrs. Cartman had sex with just about every man in town that night. Dr. Mephisto can perform a DNA test to determine who the father really is, but the test costs $3,000. How can Eric raise the money to learn the truth?