The Temporal Defense Grid is a satellite network which prevents unauthorised temporal incursions. The grid was developed at some time in the 25th century, although the exact dates are unknown. It was also unknown to the temporal powers who created the grid - it went online simultaneously throughout the Federation, Klingon Empire, Typhon Pact, Regnancy of the Carnelian Throne and other Alpha Quadrant powers, and was quickly copied by other powers. The technology features many elements of different powers' technology, many as red herrings.