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Season 4 Episode 21 – Rate of Exchange

Familiar faces turn up as Michael tries to take down the Company.

Season 4 Episode 20 – Cowboys and Indians

Michael must make a choice as chaos reigns at the energy conference.

Season 4 Episode 19 – Son of a Bitch

Michael has an uneasy reunion with Christina, who drops a bombshell regarding Lincoln. Lincoln races to stop Christina’s deadly master plan. T-Bag must prove he is a Company man.

Season 4 Episode 18 – Vs.

Michael and Lincoln come to blows over Scylla as Christina sets the wheels in motion for her plan. Meanwhile, Sara recieves life-changing news.

Season 4 Episode 17 – The Mother Lode

Michael and Sara journey to Miami while Lincoln meets with his mother. T-Bag and Self's mission to locate Scylla takes a dramatic turn. The General comes under pressure.

Season 4 Episode 16 – The Sunshine State

Lincoln and his team travel to Miami looking for Scylla. Michael learns some shocking secrets about his past while Sara searches for him.

Season 4 Episode 15 – Going Under

Following Linc's deal with the devil, Michael has his brain operation. Linc also extracts information from T-Bag, with whom he was recently reunited. Meanwhile, Wheeler and Lang transport Mahone to prison; and as Self and Gretchen await their prospective customer, Gretchen gets a phone call from her sister that's both reassuring and troubling. During surgery, Michael (who's conscious) gets unlikely help in unraveling the mystery of Scylla. Westmoreland: Muse Watson.

Season 4 Episode 14 – Just Business

While the gang continues to match wits and blows with Self and Gretchen for control of Scylla (and with the Company in hot pursuit), Mahone enlists the aid of former FBI colleagues Lang and Wheeler (Barbara Eve Harris, Jason Davis). Meanwhile, Sara raises the dosage of the drug she's giving Michael to counter the effects of his brain tumor, and T-Bag continues to hold Gretchen's daughter and sister prisoner. But T-Bag tells Gretchen's sister: "I'm as much a prisoner as you."

Season 4 Episode 13 – Deal or No Deal

As Michael, Linc, Sara, Sucre and Mahone regroup, Gen. Krantz reasserts his control of the Company in no uncertain terms as he scrambles to regain Scylla. Later, T-Bag gets a new partner in crime, and Michael and Linc have a critical meeting with Sen. Conrad Dallow (David Clennon).

Season 4 Episode 12 – Selfless

As the hunt for Scylla concludes, Sarah takes a hostage, T-Bag and Gretchen have their last stand at GATE, and Michael and Lincoln encounter Gen. Krantz. They\'re also betrayed by one of their own.

Season 4 Episode 11 – Quiet Riot

Michael risks his life by breaking into the Company headquarters with Sucre's help. Gretchen tries to get the last card key with a meeting with the general.

Season 4 Episode 10 – The Legend

Sara is left with no choice but to take Michael to the hospital as his condtion rapidly worsens. Sucre and Lincoln are faced with unknown territory as they are left in charge of the operation. Agent Self makes a surprising ally.

Season 4 Episode 9 – Greatness Achieved

Michael, Lincoln, Sucre and Bellick tunnel into the Company\'s headquarters. Gretchen meets with Pad Man. Michael\'s condition continues to deteriorate. The police question T-Bag regarding Andy\'s disappearance. Wyatt propositions Sara while Mahone awaits his shot at his son\'s killer.

Season 4 Episode 8 – “The Price”

Lincoln works to retrieve the final card, which is being held by the General. Michael and Self are forced to work with Gretchen. Meanwhile, Roland continues to be berated for losing the transcribing device in Las Vegas.

Season 4 Episode 7 – Five The Hard Way

Lincoln, Sara, Sucre and Roland travel to Las Vegas in order to retrieve the next card. Gretchen recruits T-Bag. Wyatt tracks down Self.