Synopsis: Terror-filled eyes. Lungs choked with water. A pounding heartbeat. For Sydney Bristow, it's a typical day in her not-so-typical after-school job-she's an agent for SD-6, a top-secret division of the CIA. Or so she thinks. This prequel is the first in a new series based on the smash ABC show "Alias"-it's Sydney's life before she discovers she's working for the bad guys, juxtaposing normal college life against her fabulous exploits as a working…