It was revealed in the episode "Sine Qua Non" Tigh has been involved in a sexual relationship with Caprica Six and she is apparently pregnant because of it. This relationship has therefore apparently brought about the first successful Cylon-Cylon pregnancy, something which, according to Athena, wasn't possible between two regular Cylon models. During "Sine Qua Non", Saul is temporarily promoted to the rank of Rear Admiral with the command of the "Galactica" by Rear Admiral Adama who resigns his position and elects to remain behind in the hope the missing Basestar holding Roslin will attempt a rendezvous with the fleet. Saul never actually puts on the Rear Admiral insignia given to him by William Adama.