The Polka King is a 2017 American biographical comedy film directed by Maya Forbes and written by Forbes and Wallace Wolodarsky. The film is about real-life Polish-American polka band leader Jan Lewan, who was imprisoned in 2004 for running a Ponzi scheme. The film stars Jack Black as Lewan, as well as Jenny Slate, Jason Schwartzman, and Jacki Weaver. It premiered at the 2017 Sundance Film Festival on January 22, 2017. It was released on Netflix on January 12, 2018.

Jenny Slate is an American actress, stand-up comedian, and television writer. Following early acting and stand-up roles on television, Slate gained recognition for her live variety shows in New York City and for co-creating, writing, and producing the children's short film and book series Marcel the Shell with Shoes On (2010–present). She became more widely known as a cast member on the 35th season of the NBC sketch comedy series Saturday Night Live between 2009 and 2010, followed by subsequent roles in the comedic series Bob's Burgers (2012–present), Parks and Recreation (2013–2015), House of Lies (2013–2015), and Kroll Show (2013–2015).