The USS Monitor (NX-74206) was a Defiant-class Federation starship in service in the late 24th century. Commissioned in 2371, she was the second ship of her class. (Shatnerverse novel: The Return; Star Trek: Pendragon) In 2371, under the command of Captain John Lewinski, the ship served with Starfleet Special Operations, and responded to Borg activity at New Titan. The Monitor was temporarily renamed Enterprise during a covert mission to the Borg homeworld. In a subsequent battle, the Enterprise/Monitor destroyed the Romulan warbird Avatar of Tomed. (Shatnerverse novel: The Return)