Stand Up to Cancer 8 p.m.

Taylor Swift once again takes time off from stalking to perform in this fund-raising telethon, which airs all across the dial, from the major networks to HBO and Logo. Also singing to raise money for cancer research: Tim McGraw, Alicia Keys, and Coldplay (pictured performing in Copenhagen last month). Not singing but showing up for this third “Stand Up” event: Tom Hanks, Halle Berry, Justin Timberlake, Julia Roberts, Matt Damon, Maura Tierney, Emma Stone, and Gabby Douglas.

Masterpiece Mystery!: Wallander III Sunday at 9 p.m., Channel 2

On Sunday, Kenneth Branagh (pictured, left) returns for three episodes of this moody Nordic noir, as the Swedish cop from the novels by Henning Mankell. He’s so somber! The atmosphere is so cold! On Sunday, he encounters a severed arm on a beach (I’m sure it looks amazing), and then a full dead body in his own garden. Go figure. Or sit back and let him do the work.

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Great Performances 9 p.m., Channel 2

Kisses on the bottom. Of a letter, you dirty so-and-so.

Boss 9 p.m., Starz

Tossed salad, scrambled eggs, and hard-boiled drama.

I Found the Gown 10 and 10:30 p.m., TLC

In her mind, she’s gone to Carolina.