It's just a few months now until Jack Bauer will return to television screens after a four year absence in 24: Live Another Day, a miniseries continuation of the show that aired for eight seasons across a nine year period on the Fox network. Here, the former CTU (Counter Terrorist Unit) agent will be joined in a London-set story by the ever-dependent Chloe O'Brian (Mary Lynn Rajskub), his former love Audrey Raines (Kim Raver), her father, Secretary of Defence turned President James Heller (William Devane) and a collection of new characters played by the likes of Chuck's Yvonne Strahovski, Game of Thrones' Michelle Fairley, Colin Salmon and even Stephen Fry as the Prime Minister. Whilst this new iteration will drop the series' most notable quirk events being shown in real time over a twenty four hour period it will presumably be as manic and unpredictable as its predecessor, which developed a penchant for frequently killing off characters both major and minor in a host of dramatic ways, from Ryan Chappelle's heartfelt execution at Bauer's hands in season three to Edgar Stiles' collapse from a nerve gas attack in front of his helpless colleagues in season five. This high death toll, combined with the fact that each series of the show focused on a new terrorist threat and those associated with it, meant that employment was provided for many, many actors during the show's run. This list focuses on 24 such actors, who played minor or blink-and-you'll-miss-them parts on the series, but were renowned at the time for their work elsewhere or have since become renowned for their work on other television series or films. It will not include anybody who starred as a main cast member at any point (which excludes several people, many of them ultimately quite forgettable, such as Mykelti Williamson or Freddie Prinze Jr.) or recurring characters that had a major impact on a season's plot and appeared in most its episodes, such as James Cromwell (who played Jack's father Philip), Jon Voight (who played Jonas Hodges, one of season seven's primary villains) and Arnold Vosloo (Imhotep from The Mummy and The Mummy Returns, who played season four's main villain Habib Marwan), Sean Astin (Sam from Lord Of The Rings, who played CTU staffer Lynn McGill in season five), Dennis Hopper (who played season one's final terrorist target Victor Drazen), Robert Carlyle (who played an old colleague of Jack Bauer's in the TV movie 24: Redemption) and Powers Boothe (who played Vice President and later President Noah Daniels). So, now the criteria for inclusion has been defined, let us begin.