The Cyberdyne Systems Model 101 Series 800 (AKA simply as T-800 or the older T-800 or The Guardian and "Pops") is the main tritagonist of the 2015 sci-fi action movie Terminator Genisys. this version of T-800 is one of the members of The Resistance led by John Connor and he was dropped to the past after he was sent from the future to the complicated past timeline which Kyle Reese is sended too in order to protect Sarah together with T-800 on her.
He is portrayed by the infamous legendary actor Arnold Schwarzenegger who also played T-800 from Terminator 2: Judgment Day, T-850 and Conan.