Cybelle was one of the Morlocks that lived outside of the main community of Morlocks, in the group called the Tunnelers, led by Berzerker. When the Marauders attacked the Morlocks, Cybelle along with other mutants, were trapped with the Marauders in a section of the tunnels. Cybelle started to sweat out of nervousness, and melted a wall. She attempted to help her fellow Morlocks by creating an escape route. Some Morlocks got out, but Cybelle was stabbed by one of Harpoon's spears and was killed.