Bizarre!! The black shadow's attack!!

Synopsis

Viscount Pygman sneaks into the Photon Power Laboratory, and when spotted, runs off. Koji gives chase. But drawing Koji and Mazinger Z away from the lab was exactly what Viscount Pygman wanted. He shows up inside the building again and starts attacking the staff one after another. Tipped off by Shiro, who took cover in the control tower, Koji turns to head back, only to be blocked by the Mechanical Beast Layas D5, which uses ultrasonic attacks. Can Mazinger Z bring down Layas D5 and rescue the lab from this crisis?