The narrative structure follows a "heist-of-the-week" format for the first half of the season. To unlock Scylla, Michael Scofield and his team—now working as an unofficial black-ops unit for Homeland Security—must track down six separate "Card Holders." Each holder carries a piece of the digital key required to access the drive. Structural Evolution

| Episode # | Title | Original Air Date | | --- | --- | --- | | 1 | Work That Body for Me | April 17, 2017 | | 2 | Piece of Sh*t | April 24, 2017 | | 3 | The Constellation | May 1, 2017 | | 4 | The End of the World | May 8, 2017 | | 5 | The Dirty Little Secret | May 15, 2017 | | 6 | The Tunnel | May 22, 2017 | | 7 | Bad Blood | May 29, 2017 | | 8 | Friendship | June 5, 2017 | | 9 | Bobbies and Roses | June 12, 2017 | | 10 | The C Word | June 19, 2017 | | 11 | The Big Break | June 26, 2017 | | 12 | Louie and Lincoln | July 3, 2017 | | 13 | We'll Always Have Baltimore | July 10, 2017 |

Season 4 originally aired from 2008 to 2009. It concluded the "Scylla" storyline. Many users are confused because the episode counts often vary on illegal download sites due to the way the network split the season (it was split into two "parts").

Prison Break Season 4 , often subtitled as the series' most high-stakes "Scorpion and the Frog" chapter, takes the show from the confines of iron bars into the world of high-tech espionage. If you are searching for an "index" or a complete guide to this season, here is the definitive breakdown of its "exclusive" storylines, character shifts, and special features.

| Retailer | Exclusive | Content Summary | |----------|-----------|----------------| | Best Buy (USA) | Bonus disc with “Scylla Decoded” | 12-min mini-doc on real-world CIA black boxes. | | Target | “Michael’s Journal” booklet | Replica journal pages with handwritten codes. | | Zavvi (UK) | Steelbook with alternate scene | S4E22 – Michael’s voiceover before the final shot. | | Walmart | Digital download: “Bellick’s Last Day” | 8-min short film focused on Bellick’s backstory. |

Michael and Lincoln find themselves at odds over what to do with Scylla.