The Oghens were a race of bovine-like humanoids native to the planet of the same name. Their homeworld was taken over by the Neyel Hegemony. The Neyel enslaved the Oghens, then it became the "Coreworld" of the Hegemony.
Their homeworld was destroyed on stardate 57038.4 by spatial anomalies caused by an emerging protouniverse. Over 2 million Oghens were rescued prior to the planet's destruction by USS Titan and Commander Donatra's Warbird Fleet.