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 almost full.
 * The planet that produces Excalibur is unknown. But the latest sighting is on Planet Poptropica.