Not always… They had an amputee play him when he was being frozen near the end there and his leg and hand breaks off… The shattered a frozen mould of him… A few times he is played by acting twins… So for instance, there’s two Sarah Connors at the end, and John has to decide whose the evil twin?.. Well turns out Linda Hamilton has a twin sister, and she played the evil T2… And same for the portly redheaded security sheriff’s deputy in the psyche ward.