Batman is torn between whether or not to say, "I do," when all of a sudden, Alfred, disguised as British solicitor Ethelbert Soames (of Soames, Stillwell and Thistlewaite!), arrives with Aunt Harriet. They disrupt the unholy union by claiming Cooper is the one and only Mrs. batman. Realizing she has been conned, The Diamond Queen and her Grand Mogul immediately make a break for it! Batman and Alfred speed by Batmobile to Marsha's love nest/hideaway with The Bat Antidote Kit to free Robin and the others from the love potion.
The Dynamic Duo trace Marsha to the underground cave of her Aunt Hilda, where they battle Marsha's Guardians while Hilda, armed with powerful antidotes, tries to turn them into a variety of animals. But The Caped Crusader and The Boy Wonder prove a match for her every spell and The Guardians. An undaunted Marsha then renders the heroes unconscious with knockout drugs. Hilda then applies them with her strongest potion yet, which is supposed to turn them into toads! The next day, Marsha and her Grand Mogul appears in Commissioner Gordon's office bearing caged and caped toads who speak with the voices of Batman and Robin! Marsha threatens to feed the talking toads to her pet cat unless Gordon meets her demands. It turns out, however, to have been a trick: the real Batman and Robin (after escaping from Marsha's hideout) swoop in to disarm The Grand Mogul and haul Marsha off to prison.