The daughter of the vigilante Jack Tarot, Helen McAllister assisted him as his first and (until Atomic Robo) only partner in crime fighting. In 1930, her father met Atomic Robo on the streets of Chicago while crime fighting, unwittingly leading Robo to the McAllister household. Helen managed to convince her father to take Robo on as a protege, and together (with the assistance of Nikola Tesla) they helped stop a plot conceived by Thomas Edison. McAllister seemed to take a liking to Atomic Robo, and it is implied that they were involved romantically.