Miss Martian is a White Martian known as M'gann M'orzz. She serves as a member of the Teen Titans during the year between the events depicted in Infinite Crisis and the "One Year Later" stories. On Earth, she simplifies her name to Megan Morse.

Initially, M'gann pretended to be a Green Martian, like the Martian Manhunter, and joined the Teen Titans. After her feelings were hurt through insensitivity and misunderstanding with her teammates, M'gann left the Titans to be a hero in Australia. Though the Titans suspected she might have been a traitor, it turned out that her accuser, Bombshell, was the actual traitor. After helping the team defeat Bombshell and proving her loyalty, she was accepted as a full member of the Titans

Miss Martian possesses abilities similar to Martian Manhunter. She can fly, shapeshift, turn intangible and fire energy blasts from her eyes. She is a telepath who can read minds, however people know when she is inside their mind. She also has great strength, durability, speed and stamina, as well as the ability to turn invisible. Like all Martians, she can be weakened by fire