Iron Man 3

In 'Iron Man 3' we see Tony Stark in real trouble. Yes, 'Iron Man' became what we all know, in 'Iron Man 2' faced a criminal mastermind who will even put before him an army of drones, without it going further in 'The Avengers' he faced an alien army. But not until 'Iron Man 3' when Stark (brilliantly played by Robert Downey Jr) when faces was a ruthless villain, intelligent to a fault and practically inexhaustible resources through sources that do not reveal to no gut at all production.