A Starfleet class that entered service in 2401, led by Captain Cristóbal Rios's USS Stargazer, the ship at the centre of the Borg encounter that opens the second season of Star Trek: Picard.
The Sagan class is a four-nacelle design of the early 25th century. The first ship, the USS Stargazer, registry NCC-82893, takes the name of Picard's first command and is built with systems derived from Borg technology.
In The Star Gazer the ship investigates a spatial anomaly that is broadcasting a plea for Picard. A Borg vessel emerges, its queen beams aboard and begins to take over the fleet, and Picard orders the Stargazer's self-destruct, at which point Q intervenes. The moment is replayed in Farewell, where the outcome is different. Sagan-class ships are also among the vessels turned against Earth on Frontier Day in Vox and The Last Generation.