"Avocado" Balz-Johnson was a prisoner at Fox River State Penitentiary who was assigned as Tweener's cellmate by Bellick. He caused Tweener considerable distress and was the reason why Tweener ultimately decided to escape with Michael Scofield. After Bellick was imprisoned in the second season, Avocado became his cellmate. Avocado`s most distinctive feature is his size: He is around 6`7" tall and 300+ lbs.
Tweener was assigned as a cellmate with Avocado after he was not able to give information on Michael Scofield and his escape plan to Bellick. It was hinted that Tweener was sexually harassed by Avocado as Avocado has "pulled the curtains" of the cell. (1x17) Desperate, Tweener castrated Avocado with a hidden razor blade. Avocado claimed the incident was an accident so he could deal with Tweener himself once he recovered. (1x19) Avocado could never deal with him as Tweener had escaped before Avocado returned to his cell. (1x21) Later on, Tweener was killed by the Federal Bureau of Investigation (FBI) Agent Mahone, and then was attempted to make it looked like a suicide. (2x7) Thus, Avocado never had dealt with Tweener. (Read more)