Thaddius Deming was a Human male serving in Starfleet in an alternate timeline of the 24th century. Deming was the commanding officer of the USS Premonition, a Federation timeship that travelled from 2382 to 2376 to warn Captain Picard and the Federation of an iminent Borg invasion by Locutus. Unusually, Deming wore the division color of operations as opposed to command red even though he held the rank of captain.