- Marcus' reaction to being a terminator is truly heartwrenching. This is a man who was rightfully convicted of murder. A man who wanted to redeem himself by dying and giving his body away to science. When he finds he's alive, he thinks he's been given a second chance. But then he finds himself in the middle of a war between man and machine. He does what he can to help the remaining humans and even tries again to redeem himself for murdering his brother by protecting two youngsters he has just met. Then things go downhill. Reese is captured by the machines and Wright gets captured by the resistance. To make matters even worse Marcus is revealed to not only be part machine, but a prototype of a new line of Terminators. Machines that's only purpose in life are to kill.
Connor: They know what you are even if you don't!
- After learning he's a machine, Marcus is allowed to go to Skynet's base in order to help the Resistance get Kyle back. He is now more battle damaged, and with more exposed machine parts. As he leaves, John asks him "What are you?!" Marcus, who earlier asserted that he was a human, simply responds with a dejected "...I don't know."
- When Marcus approaches the San Francisco facility to allow one of the behemoths to scan him, when it allows him in, Marcus closes his eyes sadly, probably half-hoping to be rejected as human and not allowed in as a Terminator.
- While chained to the cross in the missile silo, Marcus is callously used by Barnes as a shooting target, who shoots him on his exposed endoeskeleton with a bullet for every dead comrade he has. Marcus endures it stoically, without letting a single groan or even merely looking at him despite the evident pain. But when Blair comes to relieve Barnes and she coldly joins the shooting game, Marcus can't take it anymore and screams in agony. This is the point in which Marcus the Iron Woobie breaks up. He can take the hate from these men who have condemned him for being what he is -something which horrifies and scares even Marcus himself-, but not from Blair, the only person in his terrible world who gave him a warm smile and an opportunity to leave behind his old self. He realizes that simply there will never be hope for him.
- "Take mine. You said every man gets a second chance. This is mine."Marcus: What is it that makes us human? It's not something you can program. You can't put it into a chip. It's the strength of the human heart. The difference between us and machines.
Tear Jerker / Terminator Salvation