When Cara [Delevingne] and Dane [DeHaan] arrived, I told their agent, They need to know all this. I gave them the 600 pages. I said, You have to learn everything. You're a cop. You need to know the names. I don't want him, when he meets an alien to go, Whoa like this. I want him to know if this guy is peaceful.
Luc Besson