The premier episode of Who Do You Think You Are? which aired on Friday night didn’t disappoint . Celebrated actor Martin Sheen (Ramon Estevez) was the first of the third season. The fact that this is the third season speaks for itself. Martin Sheen has been arrested several times for his social activism and during his journey to trace his roots he discovers that his uncle was a participant in Ireland’s civil war and was a member of the IRA. Click on NBC.com to view the entire episode and read more of this season’s celebrities.