BioShock 2

"[first lines] Subject Sigma is approaching Minerva's Den. He must not reach The Thinker. Detonate the tunnel! [tunnel explodes]"

"What steps into Minerva's Den? Porter's newest toy? He wants The Thinker for himself... But you see, old friend... The machine has chosen me."

"Look at you, Sigma. You think that Porter is your ally... But The Thinker knows better. The Thinker... knows!"

"Porter's time is done, friend, and now you collude with this traitor to steal The Thinker away from me? [to himself] "Sigma"... must be removed from the equation."

"[after Sigma destroys the first Lancer Big Daddy] Subject Sigma rises above the pack, hmm? A futile gesture before the all-knowing Thinker."

"Do what you will with the girls. Twist your body with ADAM... The Thinker's perfect equation accounts for all possibilities."

"How does it feel to know that your grand purpose is foretold by a machine? The numbers know already what will happen. As I tell you this, will it affect the outcome...? Eh, I'm not so much holding my breath."

"The machine's prediction accounts for your every act... Until you reach the Thinker's core. The equation... Simply ends! I will not let such an error come to pass!"

"[from the launch trailer] For every choice, there is an echo. With each act, we change the world. One man chose a city free of law and god — but others chose corruption; and so, the city fell. If the world were reborn in your image, would it be paradise or perdition?"

"Make yourself at home, Sigma! Soon you also will be rusting here among the trash — used up by Porter, and tossed on the heap."

"I read to you now from the machine's prediction. "Sigma enters Minerva's Den. Encounters hostility." "Sigma enters Wahl's chambers." You see? The Thinker has chosen me! It does not care what I once did!"

"Porter worries you with Sofia Lamb's torpedoes? Hah! He fills your head with foolish visions of freedom. I can provide you more immediate concerns."

"The equation is nearing its conclusion, Sigma. The answers... Lie in the Core! The Thinker is waiting for you, Sigma! And so am I..."

"What is driving you into the Core, Sigma? What COMPELS you to defy The Thinker's equation?"

"Is it your deep love for Porter and for Tenenbaum? Huh! You hardly know them, Sigma! You have never... even... Met them!"

"Ryan's secret police came for Porter, long ago. And now he has... Reappeared in Minerva's Den? A man sent to Persephone does not just open his cell door and walk home..."

"I've tried to keep you from the heart of the machine! You did not listen! When the pangs of familiarity sting you, my friend... You will have only yourself to blame."

"Porter! You have forced my hand! You see?! The Thinker is shut down! That leaves only two variables: You, and me. The equation... Ends... Here!"

"Your moment has come, old friend! I stand before you, the trusted partner who put a knife in your back. Do not disappoint me!"

"Mainframe reactivated. Confirming user's genetic identity. Genetic identity confirmed: Alpha Series Subject Sigma. Former identity: Charles... Milton... Porter. [in Porter’s voice] Welcome back, Milton. [abruptly changes to the Thinker’s voice] Ending personality duplication. Subject: Charles Milton Porter."

"H... Herr Sigma! It is Dr. Tenenbaum! With the computer disabled, Minerva's Den is falling to pieces! No pressure regulation, no air supply! You must defeat Wahl and bring The Thinker back to full power."

"[after defeating Wahl] Quickly, take the Administrator Punchcard from Wahl's body and reactivate The Thinker!"

"You see now why I let the machine speak for you, Mr. Porter. We needed a voice that would be familiar... Comforting. Your own. With that copy of The Thinker's programming, we may return to the surface... And use it to restore you to the man you once were. Please, collect the print-out and meet me at the bathysphere dock. Take your time, Mr. Porter. I'll be waiting."

"The Thinker never gave up on you, Mr. Porter. It could not leave you behind. Please, step up to the console and begin the bathysphere launch sequence. We have much work ahead of us."

"Come now, into the vessel. Our work together is only beginning."

"Sarah Bolger - Eleanor Lamb"

"Fenella Woolgar - Sofia Lamb"

"Doug Boyd - Augustus Sinclair"

"Anne Bobby - Brigid Tenenbaum"

"Jodelle Ferland - Little Sisters"

"Sheryl Lee Ralph - Grace Holloway"

"Richard Poe - Simon Wales"

"Graham Rowat - Daniel Wales"

"Bill Lobley - Stanley Poole"

"John Hillner - Gil Alexander/"Alex the Great""

"Carl Lumbly - Charles Milton Porter"

"Keith Szarabajka - Reed Wahl"

"Sigma! You show such loyalty to a proven traitor. What is Porter to you? A convenient excuse to disrupt my work? Or something... More? I am curious, I must admit... But not enough to let you live."