Babylon 5, Season 5: The Wheel of Fire

[Garibaldi confronts Lyta in her cell.]

Michael Garibaldi:
I need to know, Lyta. Something's happened to your abilities. You're not a P-5 anymore, hell, you're not even a P-12. You're the strongest telepath I've ever seen. What did the Vorlons do to you, Lyta? Who…what are you?

Lyta:
I've only recently begun to understand it myself. You know the Vorlons used telepaths as weapons during the Shadow War, but what no one stopped to consider was that in a war, you have a certain number of small weapons, a certain number of medium-size weapons, and one or two big ones. The kind of weapons you drop when you're out of small weapons and the medium weapons and you've got nothing left to use.

Garibaldi:
Someone like that would be the telepathic equivalent of a thermonuclear device. A doomsday weapon.

[Lyta turns to face him, smiling, and her eyes start glowing white.]

Lyta:
Pleased to meet you, Mr. Garibaldi.