"Age of Ultron" (abbreviated AU) is a 2013 comic book fictional crossover storyline published by Marvel Comics that involved the conquest of the Earth by the sentient robot tyrant Ultron. The storyline consisted of an eponymous, 10-issue core miniseries, and a number of tie-in books. Marvel stated that all art for the series was completed before it was solicited, ensuring deadlines were met and that there were no more than thirteen tie-ins to the four-month event.