Megan Claus (more commonly known as Mrs. Claus) is a villain from the Teen Titans Go! crossover movie, "Teen Titans Go! vs. Teen Titans". She is the wife of Santa Claus.
In "Teen Titans Go! vs. Teen Titans", the Teen Titans along with their original counterparts sought help from Santa Claus to help and find Trigon and Trigon after they kidnapped Raven and Raven and traveled across the multiverse with them.
When they got to the North Pole, Santa Claus refused to help them because they were enemies. He then summoned his wife, Mrs. Claus to attack them. Upon introducing herself, Mrs. Claus noted that she prefers to go by her first name, "Megan".
Megan beat TTG Robin up and blasted snowballs at him and later attacked the OG versions of Starfire, Cyborg, and Beast Boy with candy cane swords.
Eventually, Megan got Santa's entire workshop to turn into a battlefield. She, Santa, and all their elves were fighting against both teams of Teen Titans. OG Robin said that the only thing they really needed to do to stop her was to get the worlogog away from her. The Titans shot some gears down from the factory ceiling and the gears started rolling across the floor, while the Titans ran alongside them so they could block all of Megan's shots. They jumped up close to Megan and Beast Boy turned into a pterodactyl and smacked her in the face, blasting her through the wall, and making her drop the worlogog. Cyborg quickly snatched it up from her and he and TTG Cyborg turned into a giant interdimensional traveling machine and escaped with it and the rest of the Titans.
Megan boarded the sleigh with Santa and they both chased the Titans through the portal and chased them through the multiverse hallway between universes. Megan fired lasers at them and the Titans had to try and lose her and Santa by going to a bunch of different universes. After a whole bunch of universes, the Cyborgs eventually got the idea to slam the brakes, which tricked Santa and Megan into flying past them and going into a portal that led them to a dimension, where there was a mall in December. The two of them were bombarded by a bunch of excited children who wanted to tell them what they wanted for Christmas. Megan and Santa were not able to go back after the Teen Titans after this, leading to their defeat.