The FXA-05D G-Defenser is a support fighter introduced in the anime Mobile Suit Zeta Gundam.
The FXA-05D G-Defenser is a fighter craft created to support the RX-178 Gundam Mk-II in battle and has similar concept as the One Year War's G-Fighter. It has powerful thrusters, Gundarium Alloy armor and is armed with missiles, vulcan guns, mini laser guns and a long rifle. In combat, the G-Defenser can serve as an independent support unit for the Gundam Mk-II, or dock with it to form the more powerful RX-178+FXA-05D Super Gundam.
During the docking sequence, the G-Defenser's cockpit capsule disconnects and operates independently, similar to the FF-X7 Core Fighter. As a result of this, the Gundam Mk-II's pilot takes over the control of the G-Defenser's remaining body. When docked, the G-Defenser's missile pods, vulcan guns and long rifle stay with the Gundam Mk-II, leaving the cockpit capsule with only the mini laser guns. Later, the G-Defenser is also used by RGM-86R GM III as the mobile suit has the same model of backpack as the Gundam Mk-II.