The Keeper or caretaker of the Shore Leave Planet was a male from an advanced alien race. He was the last individual of this race who resided on the Shore Leave Planet, where he was responsible for overseeing the proper operation of the planet.
In 2267, crew from the USS Enterprise visited this planet, and after a series of unexplained occurrences, met this caretaker. He offered apologies for their confusion, explaining that he had not initially realized the planet's nature was unknown to the visitors. He described the planet as a place his people had constructed so they might play. He then offered the use of the planet for shore leave, as long as appropriate precautions were taken. But he would not comment on his people, saying enigmatically that the Federation visitors were not yet ready to understand them – a statement with which Spock concurred. (TOS: "Shore Leave")
In 2269, the Enterprise returned to this world and discovered that the Caretaker had died in the interim. The landing party was directed to his simple grave. His epitaph read: "Last of his race. Ceased to function fifth day of the twelfth moon, year 7009 of this planet." (TAS: "Once Upon a Planet")