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Battle of Procyon V
In a possible future timeline, the Battle of Procyon V, fought in the 26th century over Procyon V, was the final battle in the invasion of the Sphere Builders, in which the transdimensional aliens' encroachment into the Milky Way Galaxy was turned back by the forces of the Federation, including the USS Enterprise-J. Daniels brought Jonathan Archer forward in time from the 22nd century to this battle in order to convince him of the need to join forces with the Xindi against the Sphere Builders. Daniels claimed this battle to be one of the most important events in Federation history. (ENT: "Azati Prime")
- Since the Delphic Expanse spheres were destroyed in 2154, it is unknown if this battle actually takes place or not.
Background
There is no explanation as to why a Prometheus-class starship, a variant Nova-class starship, a Template:ShipClass starship, and a starship similar to the mock Federation starship USS Dauntless are present at this battle. Even stranger is the presence of a 22nd-century Vissian starship and several 24th-century Devore warships, apparently fighting on the side of the Sphere Builders.
In reality, the producers probably added the ships as an inside joke or assumed that most viewers wouldn't notice. It is also possible that older and relatively obscure models were preferred in order to save time and money for a relatively short sequence. In-universe, this could be explained as older ships being refitted to bolster Federation ranks, as had been seen in the Dominion War; or interference from other powers due to the Temporal Cold War.