Last week, the pair made a pact that if something happened to either of them, the other would reveal what had happened to the victim's family.
According to The People, Gary - played by Mikey North - will be left dreading his meeting with Quinny's parents.
It is claimed that he will be seen telling his mum Anna: "Quinny saved my life. People are saying I was the hero for surviving, but if it hadn't been for Quinny I wouldn't be here. He was the real hero."
An insider told the paper: "This will be harrowing stuff. The realities of war in Afghanistan will be vividly brought home to the viewers.
"We hope our portrayal of the war and its consequences will be realistic and sensitive at the same time."
> North: 'Corrie war plot is emotional'