Linda and Buzz have to mend their shattered relationship if they have any hope of working together to fulfill their quest. But a brief respite in Atlantic City proves to be anything but restful: The mother of all demons lurks beneath the waves, while Supergirl's only hope of surviving an encounter with her may rest with guest star Lagoon Boy...while Buzz considers an offer from the mysterious Twilight to betray Supergirl to her enemies!