Bifrost was created as character in the twelve part mini-series titled Pantheon and was part of its main superhero team the Freedom Machine. She was created by Bill Willingham and Mike Leeke and was introduced in Pantheon's first printed by Lone Star Press in 2007.
Bifrost is the daughter of Aesir and Frost Giant blood. The last link to the Norse gods. She is the keeper of the rainbow bridge, Bifrost, from whence she takes her name. Her bloodline is the source of her powers over cold and her god-like strength