Bordering on satire, “When You Finish Saving the World” could have been a movie based on a “Saturday Night Live” skit. But it’s not. It’s a serious film debut by actor Jesse Eisenberg, based on his 2019 audiobook.

You remember Jesse Eisenberg, that awkward fuzzy-headed nerd who played Mark Zuckerberg in “The Social Network” and the kid who killed Bill Murray in “Zombieland.”

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