I am The Guardian of Forever I am construct of an unknown, ancient alien race, that apparently functions as a time portal, or gateway to other times and dimensions, located on an ancient planet where the focus of all timelines in the galaxy converge. It is apparently sentient, responding to external stimulus such as questions and actions, and can even somehow control the flow of time. It generates immense ripples in time that manifest themselves as spatial disturbances in the region around the planet where it is located.
The Guardian is located among the ruins of a large, forgotten city that stretched beyond the horizon in all directions around it. Based on initial observations, the ruins appeared to be at least one million years old.
Capable of speaking to those around it, the Guardian explained that it is "its own beginning and its own ending," and that, "since before your sun (Sol) burned hot in space, [it had] awaited a question." Apparently an inert formation of quasi-metallic substance, the Guardian creates portals to other times.I was discovered by the crew of the USS Enterprise in 2267. My powers was demonstrated when ship's doctor Leonard McCoy, suffering from the hallucinations induced by a cordrazine overdose, passed through the portal and into the past, where he inadvertently altered history. Captain James T. Kirk and his first officer, Spock, followed McCoy through the Guardian, and were ultimately successful in restoring or preserving the timeline.
In 2269, a team of historians, accompanied by Captain Kirk and Spock, used the Guardian to investigate Federation history. Their investigation included firsthand accounts of the formation of the Orion civilization and the monitoring of Vulcan history of the 2230s and 2240s. While Kirk and Spock were visiting Orion, their support team was monitoring Vulcan's past, which, in doing so, inadvertently removed Spock from the proper timeline. Spock, however, was protected from the change while he was in Orion's past, and the change to the timeline went unnoticed until he and Kirk returned through the Guardian. Once the cause was determined, Spock was able to use the Guardian to return to his own childhood on Vulcan, and prevent his death during the kahs-wan ritual.
