Tundra was one of the members introduced to Owl Woman by the Martian Manhunter to swell the ranks of the Global Guardians when they were decimated. The other members introduced at that same time were Centrix, Cascade and Chrysalis. These members are mostly shown in cameos and are not part of the current Global Guardians line-up.
Tundra has the ability to project ice and cold. She also has super strength.