The premiere was unique because Fox aired a two-hour event: Episode 1 ("Scylla") and Episode 2 ("Breaking & Entering") back-to-back, giving viewers an immediate deep dive into the new premise. This was a strategic move to combat slipping ratings from Season 3, which had been shortened and disrupted by the 2007–2008 writers' strike.
By September 2008, Prison Break had lost some of its cultural juggernaut status from 2005–2006. But the air date still drew loyal viewers eager for resolution. Key points surrounding the premiere: prison break season 4 air date
June 27, 2017 (FOX)