Nina Myers - Day One
Yet strange things started to happen and the enemy always seemed ahead of the game. Suspicions were aroused over the behaviour of Tony Almeida, George Mason and Ryan Chappelle at various stages, fuelled by comments made by the seemingly trustworthy Nina.
The murder of minor mole Jamey Farrell at CTU showed that evil was lurking in the corridors, and soon we were left wondering why Nina lied to Jack when she said his daughter Kim was dead. Did she have altruistic motives? Hell no. Before long, her mole status was unveiled and we were aghast to witness her shoot dead Jack's wife Teri after it was disclosed that she had been selling vital information to the murderous Drazen family.
A history of duplicitous acts and betrayals while working for the government was soon uncovered, but Nina's treachery didn't stop there as she ended up butchering several unfortunate souls before Jack finally put a bullet in her.
Jamey Farrell - Day One
Ironically, it was Nina who apprehended her, with the help of Tony Almeida, and she agreed to spill the beans once CTU threatened to involve her son in affairs. Before she could, she was found dead with her wrists slashed. Recovered CCTV footage later showed Nina carrying out the act.
Marianne Taylor - Day Four
Her main crime was to feed intelligence to rogue computer consultant Henry Powell, who was working with terrorists in a bid to bring America to its knees by causing a nuclear meltdown at various reactors. Marianne was very sly in covering her tracks, framing the innocent analyst Sarah Galvin as the mole with the help of a faked and planted digital voice recording.
Edgar Stiles (who visually resembled a mole, in animal terms) ended up outing Marianne's true nature and she was immediately taken into custody. However, it quickly transpired that her terrorist employers were trying to kill her as a car bomb on her vehicle was detonated when one unsuspecting agent opened a door.
She had served her purpose to the bad guys and she now posed a threat to them in case she leaked any information on them to CTU. As we all know, Jack Bauer has some very convincing methods of making people speak. Ultimately, she was killed by a terrorist assassin after striking a deal with CTU to help them, despite pleading with the gunman that she had kept schtum.
Spenser Wolff - Day Five
However, as with most things 24, there was a twist. Spenser was leaking intel to White House Chief of Staff Walt Cummings and genuinely believed that his actions were legitimate. Of course, he wasn't a happy man to discover that Cummings wasn't involved in Internal Investigations and that he had unwittingly let a hitman intent on killing Bauer into CTU.
Although he was later given the sack by Chloe, perhaps not too impressed by his bedroom performance either, Spenser did make some amends by working hard for CTU once he realised his mistakes.
> Click here for our review of the latest episode of 24