The Eternal class was a Federation starship class, a tier 6 temporal multi-mission science vessel in Starfleet service in the 31st century. It was the less combat-oriented counterpart to the Ouroboros-class temporal raider. Equipped with cutting-edge scientific technology, the Eternal class was designed to fulfill different roles in the field. Built to operate alone on the frontier or as part of a fleet, the Eternal was considered a versatile part of 31st-century Starfleet. Alongside the Ouroboros-class raider, the Eternal class saw action in the Temporal Cold War. All tier 6 starships required a commanding officer ranked vice admiral or higher. (STO video game: Agents of Yesterday)