Read Avengers United They Stand
Four avengers are training in the combat room, Black Panther, Wasp, Tigra, and Hawkeye. As they train, Bill Foster and Ant-Man are working ona project when Wasp comes in requesting Hank to fix her stingers. Wonder Man is sifting through the fridge, bringing food up to Scarlet Witch after getting something. The robot Hank was making causes him to go crazy and he attacks them all. It takes out Jarvis. An explosion also knocks out the Avengers in the training room, as well as Scarlet Witch. The remaining Avengers go to fight this robot (called Ultron), and end up defeating it.