The Temporal Prime Directive, known as General Order 157, is a principle of Starfleet and the Federation Department of Temporal Investigations that was introduced in 2268, requiring non-interference with the timeline in cases of time travel and temporal displacement. (TNG episode: A Matter of Time)

This term has been used several times on-screen, and in seemingly inconsistent contexts. See Memory Alpha article (link below) for further discussion.

External LinkEdit

• Temporal Prime Directive article at Memory Alpha, the wiki for canon Star Trek.