Level 5 planet

A Level 5 planet was a designation used by Galactic Law in reference to certain worlds, with the implication that it referred to relatively primitive planets not yet fully integrated into galactic civilization. Seeding on a Level 5 planet is prohibited by Galactic Law. (TV: Partners in Crime)

Known Level 5 Planets

 * Earth, circa late 20th century and early 21st century. (TV: City of Death, Voyage of the Damned, Partners in Crime, The Eleventh Hour (TV story)", TV: Revenge of the Slitheen'')