Tommy was a member of the Morlocks, a community of mutants living in tunnels beneath New York City. When the Morlocks were attacked by the Marauders
, a team of mutant assassins, Tommy was saved by her boyfriend Richard Salmons (an agent of the Hellfire Club
). Tommy and Richard then moved to Los Angeles, but they were eventually tracked down by the Marauders, and Richard was killed by them.
Tommy fled by hiding in a train and made it eventually back to the Morlock tunnels. Knowing she would lead them to the other Morlocks, the Marauders followed her. When they arrived in the tunnels, they immediately killed Tommy.