Ultron loads the cradle onto an eighteen-wheeler and skedaddles, the Avengers close on his heels. They race through the streets of Seoul, South Korea (where Dr. Cho’s lab is located) and the good guys get some unexpected help. The Maximoff twins have flipped their evil script, after they realized that Ultron wasn’t just going to stop at wiping out the Avengers. He’s out to eliminate all of humanity, which is just a tad too radical for their liking.
Thanks to the added firepower, the good guys eventually manage to snatch the cradle with the still-unactivated android prototype still inside.
It’s not all sunshine and lollipops, though. Ultron snatches Black Widow and takes her back to his creepy hideout.