Raising Cain1992

[Dr. Waldheim returns to Lt. Terri's office, confirming Carter is Cain]

Lt. Terri:
Carter is Cain?

Dr. Waldheim:
And Josh and Margo and God knows who else. Now it is clear to me... how Dr. Nix got all his precise data. He traumatized his own son. Then over the years, he observed the effects.

Jenny:
Does Carter know what he did?

Dr. Waldheim:
Carter didn't do anything. Cain did all the killing.

Jack:
Who is Cain?

Dr. Waldheim:
One of Carter's multiples. One of the ones Dr. Nix created when he abused him as a child. When something bad is about to happen to Carter, or when something bad has to be done, Carter blacks out and Cain takes over. After the unpleasantness, Cain exits and Carter wakes up. He has lost some time. He doesn't remember how he got where he is... or what happened while he was asleep. He may be confused, but his conscience is clean.