Doctor Robotnik’s Energy Ship (グラビトンモービル Gurabiton Mōbiru?, lit. "Graviton Mobile") is a boss that appears in Sonic the Hedgehog 3. It is fought at the end of Carnival Night Zone Act 2. It takes eight hits to be destroyed. In both Sonic the Hedgehog 3 and the locked-on version of the game, Sonic the Hedgehog 3 & Knuckles, only Sonic the Hedgehog and Miles "Tails" Prower will fight against the Energy Ship, however, it is possible for Knuckles to fight the Graviton Mobile as well.