The G-Sky is one of the different combinations of the RX-78-2 Gundam and the G-Fighter in Mobile Suit Gundam.
The G-Sky is formed by combining the FF-X7 Core Fighter with the lower body of the Gundam and the B-Parts of the G-Fighter. The B-Parts serves as a booster attached to the rear of the Core Fighter, enhancing its capabilities as a fighter. All of the armaments of the Core Fighter and B-Parts are still usable when combined. The G-Sky is classified as a support fighter-bomber and is capable of high-speed, long-distance operation. Combining the Core Fighter directly with the B-Parts without the Gundam results in the G-Sky Easy. The G-Sky and G-Sky Easy were used as references when developing the FF-X7-Bst Core Booster.