USS Nautilus (NCV-91000)

The USS Nautilus (NCV-91000) was a Federation starship, the temporal science vessel prototype in Starfleet service in the 26th century. The Nautilus participated in the pivotal Battle of Procyon V. 

History
In the 26th century, the Nautilus was part of an allied fleet, with representatives from the 22nd century to the 31st, dispatched by Temporal Agent Pavel Chekov to defend the USS Enterprise (NCC-1701-J) during the assault on the Tuterians' command sphere. The Nautilus subsequently engaged Temporal Liberation Front forces from various factions, including Krenim, Vorgons, Terran Empire, Na'kuhl, and Sphere Builders.