Saturday’s highlights on TV include:
Scarlett Johansson is the latest host of “Saturday Night Live.” The gig comes a day after “Avengers: Age of Ultron” debuts in theaters, so expect to her to don her Black Widow costume at some point. 11:29 p.m., NBC
“When Calls the Heart”: This week, it calls just after midnight. But it’s using a burner phone and pretending to be the left lung because it knows that you’re screening your calls and it wants you to pick up. 8 p.m., Hallmark
From Herald news services
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