Finally, they attempted to get out of their contract with Mephisto by sending all of Britain to Hell. The country's heroes fought them back at the Battle of London Bridge (later covered up) and took the Museum of Pagan Antiquities, sending the board to Hell instead and leaving the group seemingly gone for good. S.H.I.E.L.D. stepped in to handle the clean-up, keeping MI:13 out of the loop so they could horde the technology for themselves. Years later, various Mys-Tech bases went active again and it was believed the group were returning; it turned out instead to be a hell-warped Killpower leading a second demonic invasion, all an elaborate move by Mephisto to end all his Msy-Tech contracts and return all the energies he had tied up in abandoned bases & weaponry.