Twenty-eight documentary features will screen as special presentations during the 2013 Hot Docs Canadian International Documentary Festival that takes place April 25 through May 5th in Toronto, Deadline said.

Lineup includes the world premieres of Caucus, AJ Schnack’s behind the scenes look at the Republican candidates of the Iowa caucus; Prepare For The Worst, Barry Avrich’s portrait of comedy icon David Steinberg; and Gus Holwerda’s The Unbelievers, which observes scientists Richard Dawkins and Lawrence Krauss as they argue the importance of science and reason.

Full Hot Docs lineup including the opening night film will be announced March 19.