Spacenik was a derogatory term used in the 50th and 51st centuries. Professor Marius assumed the Fourth Doctor to be "one of those good-for-nothing spaceniks" upon concluding that his condition was self-induced. (TV: The Invisible Enemy) Descendants of the hippies and beatniks of the late 20th century, spaceniks would smuggle themselves on board spacecraft in attempts to commune with the mysteries of the universe. They would usually get in trouble and be taken home by the government. (PROSE: Doctor Who and the Invisible Enemy)