The Universe Mach 3 was a spacecraft constructed by Pearl in the episode "Space Race". It was constructed for the purpose of space travel, and to fulfil a particular liability Pearl provided herself with; travelling with Steven to see the cosmos.
The Universe Mach 3 was constructed using parts from Greg's Storage Shed, along with the banner from his van. The ship has one main thruster, producing a blue flame with pulsating rings, with eight smaller engines hidden in the wings. These engines are shown to be very powerful, knocking Greg off his feet with upon lift off. There are three retractable wheels mounted on the body.
The spacecraft is capable of reaching speeds approaching 17% the speed of light, almost 50,000 km/s (about 31,000 miles per second).