After two uneventful weeks, Ben is edgey and desperately hoping for something wrong to happen. He and Rook investigate a circus, which Ben decides to stay out of while Rook enjoys the show; however, he comes out looking like a clown, repeating "Come one, come all." Ben gets him to Plumber HQ, suspecting that Zombozo is up to his old tricks; however, Zombozo has escaped his cell and the number of zombie clowns is growing. Now Ben must try to overcome his fear of clowns so that he can save the people of Bellwood.