Excalibur

Excalibur is a UFO that you ride to Pewter Moon. It appeared on Astro-Knights island and runs on Green Fuel.

Trivia

 * It can bring you to all planets if the fuel is full. However, you only get the fuel to be a little bit full.
 * Excalibur was probably produced on Pewter Moon.
 * You only get to go to Pewter Moon in it. Then, it crashes.