Cast of Terminator Genisys

Arnold Schwarzenegger portrays Guardian, also known as The Terminator, a cyborg sent from the future to protect Sarah Connor.

Emilia Clarke plays Sarah Connor, a fierce and determined young woman who is destined to become the mother of the future leader of the resistance against Skynet.

Jason Clarke portrays John Connor, the leader of the human resistance against the machines in a post-apocalyptic future.

Jai Courtney plays Kyle Reese, a soldier sent back in time to protect Sarah Connor and ensure the future of the human race.

Matt Smith portrays Alex, who is later revealed to be Skynet, the artificial intelligence system that becomes self-aware and launches a war against humanity.

J.K. Simmons plays O'Brien, a detective who becomes involved in the battle against the machines after witnessing the effects of Skynet's actions.

Lee Byung-hun portrays Cop, who is actually a T-1000 terminator sent back in time to eliminate Sarah Connor and Kyle Reese.

Dayo Okeniyi plays Danny Dyson, the son of Miles Dyson who becomes intertwined in the conflict between humans and machines.

Courtney B. Vance portrays Miles Dyson, a scientist who unknowingly lays the groundwork for the creation of Skynet, the AI system that threatens humanity.

Michael Gladis plays Lieutenant Matias, a soldier in the human resistance who fights against the machines in the future war.

Sandrine Holt portrays Detective Cheung, a law enforcement officer who becomes involved in the battle against Skynet and the Terminators.

Wayne Bastrup plays Young O'Brien, a younger version of the character O'Brien who becomes pivotal in the fight against the machines.