Tony Almeida (18 episodes) Reiko Aylesworth as Michelle Dessler (13 episodes) Special guest appearance by Dennis Haysbert as David Palmer (6 episodes) Guest starring Episodes Production Season 4 was the first of three 24 seasons to be promoted with a prequel. The 10-minute prequel to the season was available with the third season DVD. It shows Jack being fired from his previous position at CTU and the beginnings of his relationship with Audrey Raines. It was broadcast on Sky One in the UK before the showing of the fourth season in that country. It was also available in the UK release of the fourth season DVD. Additionally, "24: Conspiracy," 12 one-minute-long Mobisodes (mobile phone episodes), were created in 2005 as a promotion for Season Four. The episodes were originally seen by cell phone users in Europe and later in the United States as part of a Fox promotion for the show. The storyline continues to follow the Los Angeles branch of CTU. Trailer FOX's trailer for the fourth season of 24 begins with Jack telling Audrey that he is glad he no longer works for CTU. This discussion is interspersed with flashbacks to action sequences from previous seasons, implying that such experiences are a part of Jack that will never go away. The end of the trailer touches on differences between season 4 and previous seasons – e.g. "the enemy is more unpredictable". This echoes comments that Kiefer Sutherland made before the season 3 finale. He said "For three years, we've done the same scenario: A specific issue generates a 24-hour response. Next season will be dramatically different." Continuous airing The Fox Network decided to implement a year-round schedule because episodes of the show would be broadcast irregularly due to the fact that Fox had recently obtained the rights to air the World Series for several years. Thus, FOX chose to air all 24 episodes, without any hiatuses, over 19 weeks beginning mid-season—with back-to-back episodes airing twice in the first week, and again at the season finale. Utilizing the extra time this opportunity afforded the writers, season four's later premiere date allowed the creators to go back to previous episodes and fill in continuity errors and plot holes, making the episode transitions more fluid and realistic. Reception The fourth season of 24 received positive reviews with a Metacritic score of 79 out of 100. On Rotten Tomatoes, the season has