After successfully trapping Mokey Fraggle and Red Fraggle during their radish gathering, Junior Gorg is visited by Wander McMooch, an evil toad who plans to create a housing development on the Gorgs' land. When McMooch persuades Junior to sell the Gorgs' Castle in exchange for fake Peas of Power, the Gorgs are forced to leave their home. Now the Gorgs' only way to reclaim their castle lies in the unlikely help of Mokey and Red.