The Wonder Twins take a trip back to their home planet of Exxor. When they arrive, they find that the evil Lord Darkon is trying to take over their planet with a new ray he has developed that make nightmares come to life. In their effort to stop Lord Darkon, Jayna, Zan and Gleek are captured. The twins managed to signal to the SuperFriends for help. Can they arrive in time to save the Wonder Twins and their home planet?