The Gool in the OVA
Aerial Fortress Gool is an aerial machine that serves as both a vehicle of transport and as a weapon in the Mazinkaiser series. Unlike its counterparts that are known for being controlled by Count Brocken, the Gool was controlled by Baron Ashura.
OVA[]
In the OVA series, Gool was used by Ashura in a plan to capture Mazinkaiser. After releasing Mechanical Beasts onto Tokyo and the Photon Power Lab sent their robots, Baron Ashura proceeded to capture Aphrodite A while in the Gool. While the plan to use Aphrodite as a hostage seemed to work even with the Kaiser being lifted up to the ship, the arrival of the Great Booster foiled those plans and Kaiser destroyed the Gool.
Tsushima Manga[]
In the manga by Naoto Tsushima, the Gool fortresses were mass produced and faced off against the Kaiser and Mazinger Army before they were all felled save for a special model that was also a Mechanical Beast.