TV picks: ‘King Charles III,’ ‘Downward Dog,’ ‘Kimmy Schmidt’ and more

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From “King Charles III:” Top row from left to right – Richard Goulding as Harry, Charlotte Riley as Kate, and Oliver Chris as William. Seated from left to right – Tim Pigott-Smith as Charles and Margot Leicester as Camilla Courtesy of Robert Viglasky/Drama Republic for BBC and MASTERPIECE

Ultimate Mother’s Day Marathon. Personally, I’d prefer to sleep in, but if your mother happens to be an early riser, this event begins at 6 a.m. with six hours of back-to-back episodes of the Mary Tyler Moore Show, followed by four movies: Stepmom (noon), Monster-in-Law (3 p.m.), Sweet Home Alabama (5:30 p.m.), and local favorite Silver Linings Playbook, with Jenkintown’s Bradley Cooper (8 p.m.).  Sunday, SundanceTV.

Masterpiece: King Charles III. Tim Pigott-Smith stars as the title character in an adaptation of the Tony-winning Broadway play, set in a future where Prince Charles has ascended the throne (and where, playwright Mike Bartlett has apparently decided, everyone speaks in blank verse — unrhymed iambic pentameter — for that Shakespearean feel).  9 p.m. Sunday, WHYY12.

Supergirl.  Calista Flockhart returns as Cat Grant for the two-part season finale, which begins this week. Flockhart, who was a regular in the show’s first season, reduced her role to recurring guest star after filming moved to Vancouver. She’s been missed. 8 p.m. Monday, CW.

Decline and Fall. The Brit-centric streaming service’s latest offering is a three-episode, 1920s-set miniseries, based on a comic novel by Evelyn Waugh, whose stars include David Suchet (Poirot) and, a tad unexpectedly, Desperate Housewives star Eva Longoria. Monday, Acorn.

Born This Way. Emmy-winning “reality” show featuring young adults with Down syndrome enters its third season with cast members continuing their  journeys toward  independence (and romance). The genre may be contrived — they all go on a cruise together in two-hour season premiere — but the people, and the emotions, still come across as genuine.  9 p.m. Tuesday, A&E.

Downward Dog.  Allison Tolman follows her breakout role in FX’s Fargo by starring opposite a talking dog (or at least a dog with very loud thoughts) in a comedy that’s much better than that sounds. Really. 9:30 p.m. Wednesday, ABC. Moves to 8 p.m. Tuesdays the following week.

Unbreakable Kimmy Schmidt. Season 3 of the comedy co-created by Upper Darby’s Tina Fey opens with Kimmy (Ellie Kemper) dealing with a new demand from her former abductor, the Reverend (Jon Hamm), and Titus (Tituss Burgess) looking for work on Sesame StreetFriday, Netflix.

The Keepers.  Is this seven-episode docu-series that looks at the unsolved 1969 murder of a Baltimore nun the next Making a Murderer? That’s the buzz, although this turns out to be a very different kind of whodunit. Friday, Netflix.

The Wizard of Lies.  Robert De Niro and Michelle Pfeiffer star as Bernie and Ruth Madoff in a Barry Levinson-directed movie based on Diana B. Henriques’ bestseller. Henriques,  the first reporter to interview Madoff in prison, plays herself. 8 p.m. Saturday, May 20, HBO.