It is a series set aboard the Enterprise (NX-01), mostly between the events of ENT: "Terra Prime" and ENT: "These Are the Voyages" -- i.e., early 2156 and 2161. It involves canonical characters such as Jonathan Archer, T'Pol, Hoshi Sato, Malcolm Reed, Phlox, et al., as well as original characters such as Lili O'Day. Characters are followed both before and after their service on the ship. Mirror universe counterparts and successor characters are followed as well.