The USS Lexington is on a mapping mission just outside the Galactic Rim when they discover a floating, unidentifiable metallic object of unknown origin. Beaming it aboard disables power to the ships engines and the crew tries frantically to get the engines operational before they drift into the rim. A science team is trying to learn more about the 'Droid', it's origin and any data it may hold. The clock is ticking for the Lexington as it drifts dangerously close to the Galactic Rim. Will they survive in time and will this unknown 'droid' play an important part in their ultimate fate?