A slew of high-profile films are debuting Tuesday at the Venice Film Festival, including Alex Gibney's Elon Musk documentary, a psychological thriller with Penélope Cruz and Javier Bardem, and a drama from Casey Affleck.

With a runtime of nearly four hours, including an intermission, "Musk" is a portrait of the world's richest man and an investigation into the scope of his power and influence. Gibney, an Oscar-winning filmmaker who has profiled powerful organizations and people before, from Enron and Elizabeth Holmes to Scientology, told The Associated Press that he started off as a kind of admirer and hoped that Musk might sit down for an interview.