X-Men: Evolution, Season 1

Professor X:
You've been carrying a terrible burden for many years, Mystique. Rogue's recent contact with you seems to have given her some of your darker memories; nightmares about a very unfortunate incident involving an infant.

Mystique:
You're fishing. You know nothing.

Professor X:
I know about your relationship with the boy, Mystique. What I don't know is what Magneto did to him. Why did you run that night?

Mystique:
[Gets up from the desk and walks to the bookcase] Dear, dear Charles. How incredibly frustrating for you; to realise that that amazing mind of yours knows so very little, really.

Professor X:
What were you two up to in that dreary castle? Was it worth the loss of your son?