Mary Ellen Popowski is a female student at P.S. 38. At some point, Teddy Ortiz and Nate Wright had a squid In science, and Teddy pretended it was a giant booger. The two boys laughed so hard that they dropped the squid on the floor. Then Mary Ellen Popowski came and accidentally stepped on it. Just then, Mr. Galvin came and started shrieking at the boys. Mr. Galvin made the boys apologize to her, and gave them a few weeks of detention. They apologized, but she kept whining that her shoes smelled like dead squid. Nate said "Maybe it was an improvement on how they smelled before." And then they had to apologize again.
Mary also joined the Trivia Slam under Gina's Geniuses. During the Fitness Zone, she made the team lose by not taking the baton from Francis during the relay race because she was scared of "Boy Cooties".
Behind the Scenes
Mary is a minor character in the series.