After Liz and Max’s triumph over Max’s clone, Jones, at the end of Season 3, it seemed a bit of happiness is finally ahead of them. But little did they know a new threat was emerging down in Mexico when a newly awakened alien arrives. With this mysterious new alien on a collision course with our heroes, we’ll discover that Jones might be gone, but his plan might just live on. Meanwhile, a new mystery that mimics the Roswell crash of 1947 forces Alex and Michael to balance personal goals and undercover work; Maria’s potential cure for her regenerative disease comes with a shocking twist; and Dallas, Isobel and Kyle discover how their families might all be connected. All these new revelations unfold as our sleepy town of Roswell, New Mexico wakes up to a daring daylight bank robbery that just might shed new light on the 1947 crash and what Max’s true purpose has been all along.