Iron Man 2 was directed by Jon Favreau and has Robert Downey Jr playing the main character Tony Stark. In this sequel, Tony is trying to find a replacement for the palladium core that keeps him alive, because it is actually killing him. Meanwhile, he is getting tons of pressure from everyone to give his technology to the military, so they can make ironman suits for their soldiers. There is this real sneaky guy, Justin Hammer (Sam Rockwell) who is the head guy of Stark Industries biggest rival company. While Tony and Pepper (Gwyneth Paltrow) and her new assistant Natalie Rushman (Scarlett Johansson) are in Russia for some kind of party they get attacked by Ivan Vanko (Mickey Rourke), who is try to get revenge for his father. Apparently Tony's dad had something to do with Ivan's dad being exiled basically, and Ivan is still pretty upset after 40 years. But he makes something similar to the Ironman suit, except he has like, two whips made out of electric current, and he calls himself Whiplash.
Well, Ivan gets arrested in Russia for trying to kill Tony, but Justin Hammer busts him out and offers him a job. He wants him to make iron man suits, and when Ivan doesn't deliver and just does what he wants by building drones, Justin gets super angry and like trys to hold him hostage and everything. Justin leaves him with some guards and goes to an expo to show off his technologies. While he's there presenting the military drones, Ivan kills his guards and hacks into the mainframe and takes over the drones, making them attack Tony and blow stuff up and all that. Then Natalie, who is actually an agent for the government, goes to find Ivan at Justin's facilities but when she gets there he's already gone. She does manage to hack back into the computer and stop the drones from being crazy and everything though.
And then if you really want to know what happens in the end of the movie, I guess you should watch it. It's pretty good, it's full of action and it keeps your attention throughout the whole tmovie.