The TVLine-Up: TV Worth Watching This Sunday

On TV this Sunday: A mystery man stirs Storybrooke, a Pan Am stewardess shows off her birthday suit, Prime Suspect goes off duty and more. Here are nine programs to keep on your radar.

8 pm Once Upon a Time (ABC) | While Mary Margaret and David continue to grapple with their unrequited love, Snow White yearns to ease her breaking heart as Prince Charming’s wedding nears; Emma and Regina grow suspicious over a mysterious stranger in town. Check out a sneak peek here.

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9 pm Prime Suspect (NBC) | Back-to-back episodes! Calderon and Duffy investigate a young girl’s rape and murder, and Jane has a tête-à-tête with Matt. And in the season (series?) finale, Sweeney orders round-the-clock security when a hit is ordered on one of their own.

9 pm Desperate Housewives (ABC) | Bree’s life continues to spiral as her alcohol consumption rises — as does her lust for men; Alejandro’s wife suspects foul play and confronts Susan; Ben has special plans for Renee.

9 pm Downton Abbey (PBS) | Isobel and Cora lock horns over control of Downton’s medical role; Mrs. Bird starts a soup kitchen.

9 pm Shameless (Showtime) | Frank pulls out all the stops to get closer to Dottie while Fiona contemplates an affair with a now-married high school crush; Jody asks Frank’s permission to marry Karen; Kevin considers buying The Alibi.

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10 pm American Idol (Fox) | Season 11’s three-part premiere concludes with a special, extended broadcast immediately following the NFC Championship Game. (Read Michael Slezak’s Night 2 recap.)

10 pm Pan Am (ABC) | Maggie tells Ted why she has reservations about Amanda; Dean pines for Colette, who plans to transfer to the Hong Kong hub; Laura is shocked to discover that the Life Magazine photographer sold her nude photos — and they are now displayed in a New York gallery.

10 pm Oprah’s Master Class (OWN) | Morgan Freeman reveals the lessons he learned throughout his prolonged rise to success, and discusses the hand of providence that brought him there.

10:30 pm Californication (SHO) | Hank hands a completed draft of Santa Monica Cop over to Samurai Apocalypse, but he still finds himself stuck in L.A. when he’s asked to take Kali, his “acquaintance” from the flight, out.

Which of the above is must-see TV for you? Also, hit the Comments to politely offer tune-in suggestions of your own.