Tess acquires a Kryptonian box that once belonged to Lionel. When Clark accidentally activates the box, he's transported to a parallel universe where Lionel found Clark in the cornfield instead of the Kents 21 years ago. In this universe, Clark Luthor is a murderer and Lois is engaged to Oliver. Clark Kent must be careful not to tip off Lionel that he's not his son while trying to figure out how to get back to Earth where the monster "Clark Luthor" was transported in his place.