Designed by Hajime Katoki, Bandai's Master Grade ZZ Gundam Ver. Ka is fully transformable into the G-Fortress. The robot's torso forms the Core Block,which transforms into the Core Fighter; it can also combine with the Double Beam Rifle, Core Top (the Gundam's upper body) and Core Base (the lower body) to form the full G-Fortress. The forehead contains the powerful Hi-Mega Cannon. More mechanical detail has been added inside the gaps that open during transformation or posing, the knee joints have also been improved with a sliding mechanism.