Jeremy Tremain was a Human Starfleet officer who served aboard the Federation scout USS Calypso in the mid-23rd century. Tremain perished along with the rest of the Calypso's crew when the ship became infected by parasitic creatures. That ship's captain, Selik, ordered the ship destroyed, not knowing that the USS Republic might have been close enough to help. He was survived by his widow, Dr. Katalya Tremain. (TOS novel: Vulcan!)