On a day like any other, all of Earth is shocked with the arrival of large alien spacecraft that appear over major cities. The aliens themselves appear benign, offering to exchange their advanced technologies in return for replenishing their supplies. The aliens' spokesperson, Anna, is downright charming eventually focusing on news reporter Chad Decker as a means of seducing Earth's population. Earthlings are soon divided into two camps: those who welcome the Visitors with open arms and those, like Father Jack Landry, who see them as a threat. For FBI Agent Erica Evans, it's work as usual but as a single parent, she is concerned with her son Tyler's apparent obsession with the new arrivals. She also learns that the terrorist cell she has been investigating may have been made up of Visitors.