"Good Morning America" anchor Robin Roberts hosts a two-hour countdown of couples who have graced television with their amazing chemistry, hilarity, friendship and, in many cases, sexual tension. Whether it's Johnny Carson and Ed McMahon, Laverne and Shirley, Tony and Carmela Soprano, Homer and Bart Simpson, Mulder and Scully or Lucy and Ethel, there is no shortage of indelible duos on television. Who will be No. 1? Find out on "TV's Most Dynamic Duos: Presented by The Paley Center for Media," airing SUNDAY, SEPTEMBER 2 (9:00-11:00 p.m., ET) on the ABC Television Network.