I don't want to give away too many spoilers, but the main plot kicks into gear when Tony sets out to create peacekeeping artificial intelligence named Ultron to protect the world.
All of the main characters from the first movie are back: Thor (Chris Hemsworth), Steve Rogers/Captain America (Chris Evans), Clint Barton/Hawkeye (Jeremy Renner), Tony Stark/Iron Man (Robert Downey, Jr.), Bruce Banner/The Hulk (Mark Ruffalo) and Natasha/Black Widow (Scarlett Johansson). Unless you hate movies and never watch television, you probably know 'Avengers: Age of Ultron' is the much-anticipated sequel to 'The Avengers,' the third highest-grossing movie of all time. Honestly, I'm glad I didn't have any kids in tow, but I'll expand on that statement later. They're one of my guilty pleasures, so of course I caught one of the first showings of 'Avengers: Age of Ultron' Thursday night before it officially opened and without any kids in tow.