Doctor Ann MacGregor was a Scientist of the 23rd century assigned on planet Gateway to study the Guardian of Forever, a temporal artefact, at Project Timepiece since James T. Kirk and the crew of the USS Enterprise (NCC-1701) discover this construction in 2267. In 2268 professor Winston Daniels discovered a gigantic version of the Guardian of Forever, security around the site was quickly increased and all the scientists working on the planet obtained clearance level alpha, included MacGregor.