Marvel Cinematic Universe

The Marvel Cinematic Universe is a shared universe created by Marvel Studios featuring its independently made films. All so far exist in the same universe, much like Marvel has done with their comics. Starting with Thor, each film's Blu-ray release has included a short film called a Marvel One-Shot. Several tie-in comics have also been released, and pre-ordering the Sega Iron Man video game, released at the same time as its movie counterpart, got you a copy of an exclusive comic book along with the game. It was also available at GameStop for a limited time, and is of dubious canonicity.