Celebrity contestants include Joanna Krupa, Nick Lachey, Vanessa Lachey, Gilles Marini, Jack Osbourne, Keegan Allen, Traci Bingham, Rosa Blasi, Brant Daugherty and Galen ...

The situation with the intruders reaches a boiling point. Violet puts herself in a dangerous position to save the others. ...

Barrett and Grover discover a disturbing conspiracy. Those trapped in the fallout shelter might have found an escape route. ...

The group must defend the school against a lethal new force. Anka and Violet must come to terms with each other in order to save their friends. ...

Barrett reveals shocking information to Grover that forever changes him. Violet must contend with new friends and new enemies. ...

Everyone's suspicious of the newcomers, especially after weapons start to go missing. Ollie and Anka try to bribe everyone with an unusual plan to get out of the valley. ...

The group struggles with their shocking new reality. Grover returns with a new group of survivors to Barrett's dismay. ...

With one member of the group in critical condition and time running out, Grover ventures out of the school and finds much more than just supplies. ...

When LeShaen returns to the school, they learn that the freaks are not the only one to fear. ...

The liars face off with their enemies in a chaotic fight that ends fatally; One liar learns a secret about her past; Another discovers something about her future. ...

Hanna goes rogue to prove that Noel is Über A; Emily unexpectedly turns to Paige for comfort; Jason and Aria look into Mary's past. ...

Emily and Paige apply for the same job; Hannah is visited by Mrs. Grunwald; Ali returns to work; Spencer and Aria pursue answers from the doctor who delivered Mary's baby ...

Ali is released into the care of Mary Drake; Spencer and Hanna search for a missing Caleb; Aria and Emily stumble upon a secret apartment. ...

As Coco gears up for an exclusive soiree, a fight with Sam stirs up memories of their friendship; and the differences that drove them apart. ...

Golden boy Troy schmoozes his way around campus at his father's behest, campaigning for student body president. But his smile hides nagging doubts. ...