"Attention current user. This is a warning. Further misuse of this terminal will result in immediate defensive action." — warning Sora and company.
"I am the Master Control Program. I oversee this system." — introducing himself.
"Decision gate reached. You are now under arrest." — "arresting" Sora and company.
"I still haven't located the password to the dataspace." — talking to Sark.
"You're dismissed, Sark. Stop any remaining anomalies in the system---or else. End of line." — ordering Sark.
"Finally. I have full access to the DTD. My takeover of the system is now complete. I might have anticipated such a simple password. What's this? An emergency destruct program for the town. Let's see how it performs." — after receiving the dataspace password.
"I'm disappointed in you, Program. Why do you insist on allying with these selfish Users?" — while talking to Tron, Sora and company.
"Really? And what command would that be?" — before Hostile Program appears.
"Warning. User control is terminated indefinitely." — while Leon types into the computer.
"What... what are you loading?" — when Aerith loaded a disk into the computer.
"Tron... Don't you understand? We don't need Users. We've advanced---they're superfluous. Be a part of me, and together the world will be ours to control!" — when first approaching him.
"Sark! all my functions are now yours!" — when reviving Sark.