Liz Ortecho wraca do Roswell, jej rodzinnego miasta i ponownie nawiązuje kontakt z Maxem Evansiem, chłopcem, którego lubiła jako nastolatka. Wkrótce odkrywa coś szokującego: Max jest istotą pozaziemską, która przez całe życie ukrywała swoje nadprzyrodzone moce.

Rocznica śmierci Rosy rozpala napięcie, gdy mieszkańcy oskarżająa Lizę i jej ojca Arturo o to, co wydarzyło się dziesięć lat temu. Max konfrontuje się z Michaelem i Isobel, którzy obawiają się, że jego uczucia do Liz ujawnią ich sekret.

Po odkryciu niepokojących informacji na temat Maxa, Liz przeprowadza różne testy, aby dowiedzieć się, co on potrafi. Kiedy Michael i Isobel dowiadują się, że Liz i Max zbliżają się do siebie, biorą sprawy w swoje ręce.

W mieście jest awaria zasilania, dlatego pacjenci szpitala potrzebują pomocy. Liz zwraca się do Kyle'a po zapoznaniu się z informacjami o nocy, w której zginęła Rosa.

Max and Michael begin to worry about Isobel after a series of mysterious blackouts cause her to spiral. Liz turns to Grant Green for help when she learns that he may have witnessed something strange on the night Rosa died. Meanwhile, Kyle and Alex uncover a secret that Kyle’s father had been keeping from everyone.

In a series of flashbacks to 2008, secrets are uncovered about Rosa’s final day, Isobel’s mysterious blackouts and Alex and Michael’s relationship in high school.

After uncovering a devastating secret about Rosa’s death, Liz takes matters into her own hands to protect herself and those around her. However, her plans are sidelined after a day with Mimi, Maria and Alex leads to a new revelation about Rosa. Elsewhere, Max takes aim at Wyatt, while Cameron decides whether she’s going to help Sergeant Manes.

With Isobel’s life hanging in the balance, Liz and Michael frantically search for a way to help her. Max turns to his mom Ann about the origins of the alien symbol. Finally, Alex turns the tables on Sergeant Manes.

Max and Michael travel to Texas to visit a faith healer, who may be able to shed some light on the alien symbol Max has been researching. Meanwhile, Maria and Liz pay a visit to the same faith healer in hopes of finding a cure for Maria’s ailing mother. Elsewhere, Alex and Kyle look into what Sargent Manes may be hiding.

Frustrated by her inability to remember what happened the night Rosa died, Isobel turns to Liz for help regaining her memories. Elsewhere, Max and Cameron investigate a series of strange deaths in the town, while Sheriff Valenti reveals information to Kyle about his father.

As the town prepares for the UFO Emporium Re-opening Gala, Liz and team find themselves on a collision course with an unlikely enemy.

When a major revelation comes to light, Max, Michael and Isobel clash over how to deal with the fallout. Elsewhere, Alex uncovers a secret about Project Shepard and enlists Kyle and Michael’s help looking into it.

Max and Michael find themselves at an impasse over how to deal with the 4th alien. Liz has a dangerous encounter with an unexpected visitor. Kyle spirals after uncovering a dark secret about his father’s death. And Michael is forced to make a difficult decision about his future.