Oorego IV was a Federation planet, the fourth planet of the Oorego system, located in the galaxy's Alpha or Beta Quadrants.
History and specifics[]
In the 23rd century, dictator Trengur had been deposed on Oorego IV and placed in an asylum.
In 2267, Trengur fled from the planet, and authorities asked Starfleet to recapture him. The crew of the starship USS Enterprise traced him to Gateway and through the use of time travel managed to retrieve him. They set course to return him to Oorego IV. (TOS comic: "No Time Like the Past")