The national premiere of "Finding Your Roots" featuring Harry Connick, Jr. and Branford Marsalis airs this coming Sunday, March 25 at 8 pm ET on PBS. Please check your local listings as air times may vary. Have a look at this clip from the upcoming episode in which Henry Louis Gates, Jr. tells Harry Connick, Jr. about his previously unknown fifth great grandfather, an infamous 18th-century American privateer who owned a ship known as The Rattlesnake.