Marvel blames Hydra for leaked 'Avengers: Age of Ultron' trailer

That's right, the terrorist organization that hangs over many stories in the Marvel Universe -- and fueled adventures in both "Captain America" films and 2012's "The Avengers" -- may be the reason you're chasing dragons on YouTube right now.
Hail Hydra, sorry ABC. This second "Avengers" film is in theaters on May 1, 2015.