Assigners' planet

From Memory Alpha, the free Star Trek reference.

This Assigners' planet is a planet approximately 1,000 light years from Earth whose existence remained unknown at least into the 23rd century. Up to that point the planet did not appear on contemporary Federation star charts. This was due to active concealment of the fact of the existence of the planet by its technologically-advanced inhabitants.

The Assigners, inhabitants of the planet, wanted to help Earth survive its early technological age. To this end, around 4000 BC, they took certain Humans to serve as the forebears of a pool of genetically-perfect Earth operatives. As Gary Seven, one of their Class 1 Supervisors, said on Earth in 1968: "A truly advanced planet wouldn't use force. They wouldn't come here in alien forms. The best of all possible methods would be to take Human beings to their world [and] train them for generations until they're needed here."

These agents were Human but flawless: not even the Vulcan nerve pinch could stop them. They were transported back to Earth as needed by means of an incredibly powerful transporter beam which, in the one case where it hit the Enterprise, shook the vessel violently and locked her circuits wide open (fusing those having to do with recording). At least one agent was accompanied on the interstellar beaming by a humanoid who preferred to appear to be a domestic cat (or vice versa).

Gary Seven followed two agents dispatched to Earth, 201 and 347, on the day in 1968 when there occurred a major assassination, an Asian coup d'etat, and the launch into orbit of a US nuclear weapons platform. Seven came because the agents, dead in an automobile crash, had been incommunicado. He took over their assignment – which was to effect a misfire and near-holocaust to frighten the USA and the other major powers out of their foolish "balance of power" strategy – and completed it by the skin of his teeth. (TOS: "Assignment: Earth")

[edit] Apocrypha

The race that inhabited this planet have been referred to in several novels and comics as the Aegis.