Alias2001

Sydney Bristow:
How is this possible without obvious scarring?

Jack Bristow:
The procedure isn't surgical. A patient's genetic code is altered to reshape their physical attributes.

Sydney Bristow:
Is it reversible?

Jack Bristow:
It's unclear. It only works on people of a certain genetic disposition and the recipient must be induced into a comatose state for several days while their cells regenerate. The data indicates the only way to distinguish the real person from the double is by an ocular scan. A flaw in the iris was deliberately built into the procedure to tell them apart.