The 4th and final season of Prison Break (which returns April 17th) started airing in the US on Monday, September 1, 2008 with a double episode (note Tues, Sept 2nd in the UK)…. The first 16 of 22 ordered episodes aired through Monday, Dec 22, 2008 when FOX put it on an extended hiatus. The final episodes wrapping up the series return to air on Fridays on Fox starting April 17th in the US. (Tues, April 21, 2009 in the UK)..
Supposedly, Fox will repeat episode 16 at 8pm on Friday then air a new episode 17. The series will air for 5 weeks concluding with a double episode..
The rumored 2-hour tv movie will not air on Fox but is expected to go directly to dvd. (MORE)