In season four, Kiera Cameron and the mysterious time traveler, Brad Tonkin must battle the Future Soldiers who arrived in a flash of light in the last moments of season three. Meanwhile, Kiera's alliance with the remaining members of Liber8 challenges her relationship with both Carlos and Alec Sadler. Kiera must also face off against Kellog, who is using every option available to him to become the ruler of a dark future built in his image.
Kiera, injured during her and Brad's escape from the future soldiers, has a renewed desire to return to her son in the future. Brad reunites with the future soldiers in a bid to gain their trust and work from the inside. Alec gets revenge on Kellog by hacking into Piron which causes unexpected consequences and revelations.
Kellog uses Alec's weakness against him. Kiera tries to negotiate. Alec sets out on his own to try to save Emily.
Alec joins Carlos and the VPD. Kiera and Garza form an alliance.
Kiera and Brad's trust reaches a breaking point. Carlos and Kellog come to their own realizations; Alec has a strange encounter.
Kiera pressures Carlos for more time. Kellog faces unexpected danger. The future soldiers plan a raid.
Kiera and Alec risk everything to stop the future soldiers.