Dillin and Cuidera bring back the Mole for his second and final outing against the team in Blackhawk 125 (June 1958).
The Mole has a new digging machine in this one, which comes with an atomic weapon! He is using it to try to rob an armoured car, which seems like a bit of overkill. The weapon doesn't have very much power, and as it weakens, it winds up hitting Blackhawk. The team are scared that he will die, but instead he gains all manner of super-powers. Flight and strength, x-ray and telescopic vision.
Blackhawk uses these new powers to face off against the Mole and his men, while the villain tries, and fails, to duplicate the precise situation that gave Blackhawk his powers. The powers fade by the end of the story, but by then he has captured the Mole.