Mario (voiced by Chris Pratt) and Luigi (voiced by Charlie Day) are two small brothers living in New York with their stereotyped Italian family. They've just quit their work with another plumber to start their own company ("Super Mario Brothers") and spent all their remaining money on a cheesy TV ad for their new company. The ad is mocked by their former boss (who is much larger than them). When the brothers see on TV that the entire city of Brooklyn has plumbing problems, they set out to fix them ... and get sucked into Warp Pipe (a mainstay of the video game) with Mario ending up in the Mushroom Kingdom, and Luigi ending up a captive of the evil Koopa king Bowser (Jack Black). Bowser aspires to marry Princess Peach (Anya Taylor-Joy), and views Mario as a rival as Mario trains with Peach to defeat Bowser's army.

This is idiotic colourful fun. The critics didn't think much of this, but no one cared what they said and it's gone on to huge commercial success. I'm mostly with the critics, but grudgingly have to admit that, while it's pretty bad ... it's also moderately entertaining.