Thousands of fans saw the movie at midnight in New Orleans area theaters, and some spent all day at the theater watching the first two Iron Man movies and the Avengers in a Marathon before seeing Iron Man 3.
What did they think?
"I'm pretty worn out now, but it was worth it," one man said after more than eight hours at the movies.
"It was awesome," one woman told WWL First News. What was awesome about it? "Everything!"
"The whole cast was really, really good," a man wearing an Avengers T-shirt insisted. "Robert Downey Jr. is really on his A game... I really did enjoy it."
They had to be among the first to see the film full of huge plot twists and intense action.
"I had to see it, couldn't wait," one man explained.
A woman told us, "I am a huge Iron Man fan."
Screen after screen was sold out.
This kicks the summer blockbuster season up a notch with a cavalcade of expected box office smashes in the coming weeks and months including new Star Trek, Superman, Wolverine and Lone Ranger movies just to name a few.