Class Q planet

The Class Q type of planet has been rarely encountered by the Federation. In 2268, the USS Enterprise conducted a survey of Delta Canaris IV to ascertain its suitability for colonization. (TOS novels: The Klingon Gambit and Mutiny on the Enterprise).

In 2285, the Genesis Planet was born from the Mutara Nebula and was formed as a Class Q planet. While the planet contained some microscopic life-forms, the planet ultimately proved unstable because of the protomatter that was used during its creation. As a result the planet exploded. (TOS movie: Star Trek III: The Search for Spock).