The complete third season of the real-time drama series. Three years on from the events of Day Two, Federal Agent Jack Bauer (Keifer Sutherland) has successfully captured and imprisoned the head of a Mexican drug cartel. But when a van deposits a dead body outside the LA Health Unit infected with a deadly virus, the Counter Terrorist Unit uncover a plot to blackmail the US Government with the threat of a released bio-weapon that will kill millions to ensure the release of the drug baron. Jack must infiltrate the gang and rid the world of the virus threat. Meanwhile, President Palmer is in LA seeking re-election to a second term, with his new chief of staff and girlfriend in tow.