The action star returns to the role that made him a household name in Terminator Genisys, the fifth film in the series, with the same ripped body.
"For this movie, I worked out extra hard because I had to get the size back the way I was in 1984, because the skeleton of the terminator doesn't change," Arnold told ET.
In the film, a fractured timeline is created when the leader of the human resistance, John Connor (Jason Clarke), sends Sgt. Kyle Reese (Jai Courtney) back to 1984 to protect Sarah Connor (Emilia Clarke) and safeguard the future. This causes Sgt. Kyle Reese to find himself in an alternate version of the past with unlikely allies, including the Guardian (Arnold), dangerous enemies and a new mission to reset the future.