Robert Knepper makes his first appearance as Theodore "T-Bag" Bagwell, but was not yet billed as a regular character until the following episode, "Cell Test".

Michael Scofield and his cellmate, Fernando Sucre (Amaury Nolasco), face a lockdown in order for the guards to search cells for contraband.

Michael asks C-Note (Rockmond Dunbar), the inmate who procures items outside the prison with the help of friends, to obtain PUGNAc so that he can make regular trips to the infirmary, where Dr. Tancredi will give him insulin shots.

She attempts to talk to Crab Simmons (Tab Baker), who knows Lincoln is innocent but who didn't testify at his trial, but is told that he was killed of a faked drug overdose.

However, C-Note sees him in T-bag's cell trying to persuade him to return the screw, and when he later confronts Scofield, he refuses to hand over the PUGNAc pills.

C-Note sees this and a black inmate, stepping in between them, stabs the cellmate several times; the wounded man dies in Michael's arms, covering him with blood.

After the lockdown is finished, C-Note gives Michael the PUGNAc due to his belief that he fought on the side of the blacks, but tells him he will eventually find out what he's up to.

Alongside the Pilot, "Allen" was given viewing figures of 10.5 million, with a rating of 4.6 among the 18-46 age group, making it the seventh most watched show in that week.

[1] After its UK release, the episode received figures of under 1 million viewers, and didn't register as the top 30 most watched programming for the week it aired, according to BARB.