Ninety-seven years after the planet Earth was destroyed, generations of survivors are faced with dwindling resources.

Dylan Bates, Norma's older son from a previous marriage, arrives in town - much to the family's displeasure - and Norman spends more time with Emma. Meanwhile, he is with another friend, Bradley, at a bus stop when they witness her father have a car accident and discover he is badly burned. Starring Freddie Highmore and Vera Farmiga.

Dylan starts his new job and learns that there is more to it than he thought; Norman and Emma make a shocking discovery.

Having spent the night with Bradley, a contented Norman returns home to find that his mother is in jail, arrested for the murder of Keith Summers. Her bail is set at $100,000, but she refuses her son's offer to help her.

Clarke's fledgling romance with Finn is threatened by a new arrival. After being knocked out in a fall, Octavia wakes up to find a Grounder watching her.

Clarke and Bellamy discover there may be a hidden stash of supplies that could help the group to survive the winter. They go on a mission to locate it and are brought closer together by a terrifying experience.

Bellamy leads his crew into Grounder territory as they search for Octavia in the forest. Raven can't help but notice the deep connection between Finn and Clarke.

City Protective Services officer Kiera Cameron is transported from 2077 to deal with eight of the world's deadliest terrorists.

After receiving a disturbing call from Lana, who sounds in distress, Clark discovers that she is alive and well.

Oliver suspects that Diggle's former mentor in Afghanistan is responsible for a spate of armoured truck robberies.

Keira's cover is blown and she is arrested by VPD officer Carlos. When she discovers that Liber8 are devising a plan to take them back to 2077.

Kiera and Carlos investigate a series of murders where the victims have holes bored into their heads. Kiera receives a gift.

While Carlos struggles emotionally, he and Kiera must stop Liber8 from unleashing a chemical attack on the city.

Kiera tries to stop the bombing of a building. Alec is kidnapped by Liber8 when he realises Juian is under their sway.

Kiera fights old friends by joining up with former enemies; a season full of choices comes down to one unbelievable moment.

Alec travels one week into the past and makes changes to the timeline to try and save Emily. Kiera jeopardises everything to stop Alec.

Kiera discovers what's controlling the bank robbers; Carlos' new knowledge of time travel starts to affect his work.

Dillon is among the hostages taken prisoner by Liber8 at a television station. While Kiera and Carlos work to free the inspector and the others, a business alliance between Kellog and Alec turns sour.

New Vice President Kinsey asks the president to put the Stargate program under his command.

Kiera's relationship with the Freelancers is strained; Alec crosses the Rubicon to protect his legacy.