The Lemon Rocket was built by Sir Cumference to travel at incredible speed and was later modified into space.
Probably the most outstanding use of the Lemon Rocket is when Pac and Grinder travel into space to stop the ghosteroid from destroying the world. Pac was also assisted by the Ghost Gang as they recovered his lost planet berry. Interestingly, after gobbling up the ghosteroid, Pac returned to PacWorld with Cyli and Spiral in the Pac-Erchini while Grinder was left in space with the Lemon Rocket, forgotten for an unknown amount of time. Since "Cave PAC-MAN", Sir Cumference added an upgrade to the Lemon Rocket, evolving Pac's first transformation: Ice Pac-Man.