Zoon is an egg-shaped planet near the edge of the Milky Way Galaxy and home to the similarly egg-shaped Zoonicks. Since its first contact with other planets it has been known for friendliness and hospitality to all galactic travellers.

The planet's atmosphere has been thin since prehistoric times, but over the last few million years it has thickened considerably due to the exponentially rising populations of both oxygen-producing plants and carbon-dioxide producing animals. Zoon was the primary founder of the Galaxy Rescue Squad.