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    Critic’s corner: What’s on TV Friday

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    Patton Oswalt: Tragedy Plus Comedy Equals Time Friday, 10 p.m, Epix

    In the past few years, comedian and actor Oswalt (“Ratatouille”) has built up an impressive set of credentials on the big and small screens. He can currently be seen in “The Secret Life of Walter Mitty.” He’s narrating the ABC ’80s comedy “The Goldbergs,” had a memorable guest role as Constable Sweeney on “Justified,” dropped in on “Brooklyn Nine-Nine,” “Parks and Recreation,” “Two and a Half Men,” and “Community.” He’s become a huge personality on Twitter, amassing over 1.5 million followers. And he’s maintained his stand-up career, as evidenced by this new special of his latest material.

    When Calls the Heart Saturday, 9 p.m., Hallmark Channel


    This new series starring Lori Loughlin (“Full House”), Erin Krakow (“Army Wives”), and Daniel Lissing (“Last Resort”) began life as a film on the network. The ratings were good enough that a full series was commissioned, based on the best-selling Janette Oke series about the Canadian West. Set in the 19th century, the story centers on a small coal-mining town in which a deadly accident forces newly widowed women to go to work in the mines themselves.

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    Cold Justice Friday, 8 p.m., TNT

    True, chilly, crime.

    The Diamond Collar Friday, 10 p.m., OWN

    Going to the dogs.


    Betrayal Sunday, 10 p.m., ABC

    All over but the suing.

    Sarah Rodman can be reached at