All the President’s Men Revisited Sunday at 8 p.m., Discovery
This special looks back at Watergate, which changed politics and the media forever and which is now the etymological culprit behind hundreds of “-gate” scandals. Produced by Robert Redford (pictured), the two-hour documentary also looks at the movie that Watergate inspired, “All the President’s Men.” There is footage of Richard Nixon as he prepares his resignation speech, as well as a conversation with Redford and Dustin Hoffman, who say they memorized each other’s lines so they could finish each other’s sentences.
The Bletchley Circle Sunday at 10 p.m., Channel 2
This three-part PBS series is about four women who spent World War II deciphering German codes. A decade later, they reunite to help solve a string of murders, despite resistance and condescension by the police force. Anna Maxwell Martin, so quietly compelling in “Bleak House” as Esther Summerson, is the star, along with Julie Graham, Rachael Stirling, and Sophie Rundle (pictured). Rundle, by the way, was in Matt LeBlanc’s “Episodes.”
Orphan Black 9 p.m., BBC America
She is she as she is she as they are she and they are all together.
Bet on Your Baby 8 p.m., Channel 5
Cards, babies, easily interchangeable.
Four Houses 10 p.m., TLC
And a shopping mall.Matthew Gilbert can be reached at email@example.com. Follow him on Twitter @MatthewGilbert.