As reported by Deadline, Ethan Hawke has joined the cast of Luc Besson’s Valerian And The City Of A Thousand Planets (a title that demands to be said in full), a big sci-fi action epic that we still don’t know a whole lot about. It’s fitting, then, that we also don’t know a whole lot about the character Hawke will be playing. Besson is reportedly planning to only have five human characters in the film, so we can assume Hawke will be one of them, but there’s not much to say beyond that. The other humans will be played by Clive Owen, Rihanna, Dane DeHaan, and Cara Delavingne, with only DeHaan and Delavingne’s roles officially confirmed (they’ll be playing Valerian and Laureline, the main characters).