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Romana II noted that, in terms of applied socioenergetics, the "vampire planet" was losing its grip on level-two development and that a society that evolved backwards must be subject to powerful forces restraining it. (TV: State of Decay)
Comparable labels were applied to other level 2 planets, (PROSE: Ghosts of India) level 4, (AUDIO: The Four Doctors) level 5 planets (TV: City of Death onwards) and level 6 planets, (PROSE: Ghosts of India) other than grade 3 planets (TV: The Ribos Operation) and class 3 type planets. (PROSE: The Pit)