Quorra and Sam escape into the real world. A battle at the portal kills both CLU and Flynn. Sam retrieves the disc and rescues Quorra. Quorra is captured and CLU reveals his domination plans. She is revealed to be the last living ISO. He is betrayed and the disc taken, but Flynn rescues him and they stowaway on a ship where Flynn repairs the injured Quorra. Sam returns to the CLU's territory to find a program that can help him escape. Flynn's identity disk is the key to the portal and they can't go through without it. Sam's appearance is a plot by CLU to lure him there and open the portal again so that he can go through and impose his system on the actual world. The portal between the Grid and the real world closed and Flynn was trapped. CLU turned on Flynn and imprisoned Tron before he destroyed the ISOs. During the system's creation they discovered ISOs, an algorithm species with the potential to solve all of life's mysteries. On the outskirts of the Grid, Flynn reveals to Sam that he'd co-created a perfect system with CLU. CLU tries to kill Sam but he is rescued by Quorra, a student of Flynn's, who takes Sam to his father. When he bleeds the inhabitants of the virtual world realize he's human and bring him to CLU, the ruler of the Grid and an avatar of Sam's father. Sam is immediately thrust into a series of games in which he must compete to the death.

Sam finds a secret basement room there and is unwittingly pulled into the virtual world his father created called the Grid. Sam receives a visit from a friend of his father asking him to investigate a strange signal from his father's old arcade. Software engineer Kevin Flynn disappears in 1989, leaving his successful company and his son, Sam, behind.

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