Roswell, New Mexico

In the season premiere, Liz (JEANINE MASON) suppresses her grief at Max's sacrifice to focus on moving out of Roswell with her resurrected sister, Rosa (AMBER MIDTHUNDER).

While Michael (MICHAEL VLAMIS) helps Maria (HEATHER HEMMENS) deal with a family crisis, Rosa turns to Kyle (MICHAEL TREVINO) to learn the truth about the night she died.

Alex (TYLER BLACKBURN) and Michael work together to unravel the mystery surrounding the night Nora's spaceship crashed in 1947. JASON BEHR guest stars.

On the verge of a breakthrough in her quest to save Max (NATHAN DEAN), Liz turns to Kyle for one last favor that could potentially land him in hot water.

Complications with Max's pod forces Liz, Michael and Isobel to confront the possibility that they may not be able to save him. Elsewhere, Maria and Alex make amends.

Maria's investigation into her mother's disappearance leads her and Alex to the home of a mysterious stranger. And Isobel's night out leads her into the arms of someone unexpected.

Liz is forced to revisit a painful part of her past when her mother, Helena (BERTILA DAMAS), shows up at the diner unexpectedly. And her arrival in Roswell sends Rosa spiraling.

Despite promising that he'll take things easy with his new heart, Max sets out to find Cameron after learning that she's gone missing; and Rosa makes a decision about her future.

After uncovering a surprising connection to their past, Michael and Isobel learn the painful truth about the night Tripp (JASON BEHR) attacked their mothers.

While the others uncover secrets from the past, Cameron encourages Liz to reach out to someone from her past after her father, Arturo (CARLOS COMPEAN), gets detained.

While Max enlists Kyle's help in getting to the bottom of the recent abductions, Michael does his own investigating into Alex's disappearance.

While Max & Liz investigate a deadly plan, Maria and Isobel take drastic measures to learn more about the night Mimi (SHERRI SAUM) disappeared.

After learning of a deadly threat, Liz realizes that she can't save everyone – and with Max in danger, she and Isobel must make a heart-wrenching choice in the season finale.