Gradabug is the chief engineer of CloudRunner Fortress. He is in charge of manning the power generator room. Fox McCloud first meets Gradabug in the dungeon after he is captured and gets his staff back by using the SharpClaw disguise Slippy gave him. There Gradabug gives Fox the key to the generator room. Gradabug also tells Fox where to find the Queen CloudRunner when General Scales captures her again. He also tells Fox that he must return the Spellstone to the Ocean Force Point Temple.
- Gradabug is one of the only two dinosaurs not belonging to any particular tribe, the other being Shabunga (the ShopKeeper). However, the Nintendo Power Strategy Guide indicates that he is a member of the bonehead tribe.