Space Ninjas were a race of warrior-like ninjas, who lived on an unspecified planet.
During a war with the Vortexalings, one ninja put the planet into a vortex shift, hiding it away for times unknown. When the Beginner arrived in the galaxy system, he was surprised when the planet re-appeared in a flash of bright light and decided to investigate. The Beginner aided the Space Ninjas in the war, where by sending vortex energy to the nearby mothership all of the Vortexalings de-activated, saving the planet. (The Ghost Planet)