Farnsworth "Dex" Dexter is a fictional character on the ABC prime time soap opera "Dynasty". Portrayed by Michael Nader, the character was introduced as a love interest for Alexis Colby in the series' fourth season in 1983. He became her third husband, and arguably the second great love of her life, after Blake Carrington. Even after the end of their marriage, Dex remained a strong force in Alexis's life. Dex Dexter remained on the series until its final episode in 1989.