 A more alternate title would be "Dawn of the Syd." When Sydney gets bitten on the neck by a missing in action CIA agent, she soon finds out that she has been infected by a experiential hallucinogen, causing her to lose slowly lose touch with reality, and physically transforming her into a highly-string, ghastly-pale, yellow-eyed type of zombie. Vaughn and Jack must race against the clock to find an antidote before Sydney puts her life (and others next to her) into danger.