Brannon Braga talks about adding the "Temporal Cold War" plot device to the show at the request of the studio. Rick Berman talks about how it added flexibility to stories where it added factor that can useful. Mike Okuda talks about how it makes very hard to keep a consistent time line for cannon with all the possibilities that time travel makes possible. There is several screens showing memorable parts of Star Trek that make use of time travel from both the movies and TV.