About a month after giving birth, Sydney returns to duty when Anna Espinosa is recruited by Peyton to kidnap Will Tippin. Espinosa implants an explosive in Tippin's head and demands that page 47 of Rambaldi's manuscript be turned over to her in return for the disarming code. Sydney and Will battle Anna but lose page 47, and in the process Anna uses an unknown chemical agent to collect genetic material from Sydney. Anna goes through the genetic doubling process and becomes Sydney's duplicate.