The actor of the title character in the most expensive European and independent film ever made also played which character in 2014's The Amazing Spider-Man 2?
Dane DeHaan:  His roles include Jesse on the HBO series "In Treatment", Andrew Detmer in "Chronicle" (2012), Jason Kancam in Derek Cianfrance's "The Place Beyond the Pines" (2012), Lucien Carr in "Kill Your Darlings" (2013), Harry Osborn in "The Amazing Spider-Man 2" (2014), James Dean in Anton Corbijn's "Life" (2015), Lockhart in Gore Verbinski's "A Cure for Wellness" (2016) and the title character in Luc Besson's "Valerian and the City of a Thousand Planets" (2017). Valerian and the City of a Thousand Planets:  Besson independently crowd-sourced and personally funded "Valerian" and, with a production budget of around $180 million, it is both the most expensive European and independent film ever made.
Harry Osborn