A vast Federation starship of the 26th century, shown to Jonathan Archer by the time agent Daniels as it fights the Sphere Builders at the Battle of Procyon V.
The Enterprise-J appears in the Enterprise episode Azati Prime. As Archer prepares to fly a suicide mission against the Xindi weapon, the temporal agent Daniels pulls him four hundred years forward on to one of the ship's corridors.
Through a window Archer sees a battle in progress at Procyon V, where a Federation fleet is driving the Sphere Builders back into their own realm. Daniels tells him that the crew includes Xindi serving beside humans, Vulcans and Klingons, and that this future depends on Archer living to make peace.
The ship is seen only briefly from outside: a very wide, thin saucer and long, slender nacelles. Daniels presents it as one possible future, not a fixed one.