The Rigans are an alien race from the planet Riga. They either view humans as nothing more than animals, or they simply do not care about their freedom, as they have been known to capture humans for their zoo exhibit. They possess incredibly advanced technology, such as an indestructible robot.
- Rigan captain (captain of the Rigan flying saucer)
- Rigan lieutenant (second-in-command of the Rigan flying saucer)
- Rigan food server