|Invincible Fortress Demonika|
|Power Source||Geothermal Energy|
|Pilot|| Great Marshall of Hell
Seven Generals Marquis Janus
|Dimensions|| Length: 630 meters
Height: 350 meters Weight: 325 tons
|Performance|| Maximum speed: Mach 1.2
Water speed: 36 knots
Demonika features a similar design to the Gool with its reptilian-like head. It is capable of travel on land, sea, or air, and even dig underground. It is armed with an entire arsenal of missiles that it can launch at once. The mouth opens to launch the Warrior Beasts. It is also highly durable, able to resist the Thunder Break and Breast Fire without so much as a scratch.
After being revived, Dr. Hell personally crafts the Demonika to crush his enemies. It was mainly around to deploy Warrior Beasts and provide additional fire power for the generals. It was destroyed in the final battle by the combined efforts of Mazinger Z, Great Mazinger, Venus A, and Diana A consuming Hell and Marquis Janus.