Dr. Poison
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Real Identity: Princess Marina Maru
Affiliations: Markovia
Appearances: Party Animals
Powers/Skills: Knowledge of Science
Voiced By: Melanie Minichino
Princess Maru used Jimmy Olsen's fame to gain access to Metropolis' tenth annual The Curt Swan Awards For Humanitarian Excellence ceremony as his date, through W.O.R.M.S., and she later accepted an invitation to deliver a keynote speech. On the night of the gala, Cat Grant asked Princess Maru if Jimmy Olsen really was her date. Kara Zor-El was not pleased he brought a date to the gala where she was receiving an award. Kara asked Olsen to introduce his date. Maru told her she and Superman were greatly admired, even in Markovia, and thought Metropolis was fortunate to have them both. Kara deferred all the credit to Superman. Olsen disagreed then started rambling about feelings but Maru commended him for being so kind to his platonic friend. Maru's henchman took out the guards at receiving and carted in her gas containers. Kara boiled as Maru flirted with Olsen. Kent noticed and tried to direct her attention to the bones of the blue whale on display but he finally realized the Newskid Legion was gone. He promised to return by the time Kara's award came up.
Maru's henchmen locked all exits, disabled all the alarms, and redirected the local feed of the security cameras. Vicki Vale approached Princess Maru and asked if she feared public backlash or even persecution for her endorsement of free expression. Maru admitted she received several death threats but she always took the necessary precautions. Lois Lane noticed the increased security detail and left the table to investigate. Vale taunted her. Lane imitated her. The Newskids ran down a hall and came upon Maru's containers and a tied up guard. Flip Johnson wondered if they should tell someone but a henchman found them. Silver St. Cloud revealed to Lois Lane the added security was Princess Maru's private detail. Kent defended the children and took out the henchman but suffered a gunshot to his left arm. They ran away from more henchman and hid in a janitorial closet. Lois Lane soon joined them. She sprayed Vulture in the face so Kent could lock the door. He radioed Fox to confirm when they had hands on the Princess.
St. Cloud welcomed Maru to the stage to deliver her keynote speech. She declared she wanted to be called Dr. Poison and she was curing Mother Earth of the disease of mankind. Olsen mused he had a type. Dr. Poison's gas turned nearly everyone into various animals. Kara grabbed Dr. Poison but she revealed she had henchman stationed at the Metropolis Dam, ready to release her gas directly into the city's water supply. Olsen told Supergirl to save the city while he dealt with Poison. Vulture kicked the door in but the room was empty. He was transformed by the gas into a crocodile. Kent, Lane, and the Newskids escaped into the ventilation shaft. Olsen called Kent and Lane for advice on dealing with Poison. Lane suggested using his boyish charms. Olsen transformed into a turtle. Vulture cut them off in the shaft. They reversed course. Poison ordered her team to the helicopter. Olsen confronted her about their animal connection. She hesitated.
Lane accidentally pushed a shaft cover down and got an idea. She pounded a shaft repeatedly until the section containing Vulture fell down below. Her section fell down, too. She jumped back up to the others in the form of a cat. Maru admitted to Olsen he was just a pawn. He wanted to tell her one more thing then he yanked her gas mask off. She transformed into a fox. Bizarro prevented Dr. Poison and her henchman from escaping by helicopter and left without anyone else seeing him. Supergirl returned and discovered them restrained with a piece of debris from the helicopter. S.T.A.R. Labs technicians helped turn victims of Dr. Poison back into humans. Poison told Olsen he would find true love someday. He admitted he was already in love with someone but was really, really stupid about it. Poison thought he was talking about her. Olsen stated it was Kara. Supergirl heard all of it. A leash was placed on Poison and she was led away.