Michael is back to avenge Sarah in the fourth season installment of Prison break. Michael still thinks that Gretchen was responsible of the death of Sarah and he is determined to get to her to avenge his lost. However, as the show progress, Michael discovers a lot about the truth of the death of Sarah. Michael learned that Mahone and Whistler are working together to bring down the Company. Later on, the Company found out about this plan and took charge to take the life of Whistler.

The Sona was burned down and chaos was all over the place which led to the escape of T-Bag, Sucre and Bellick. Don Self finally convinced Michael to join team in exchange of Michael’s freedom. Like Michael, Don is targeting to put down the Company. Michael also found out that Don used to work as an agent for the Department of Homeland Security.

Lincoln was brought back to Chicago from Panama. Bellick, Mahine and Sucre were also brought back to Chicago. Meanwhile, Sarah is still alive and was able to escape from the hands of Gretchen. The Company was not pleased with this so they took Gretchen as their prisoner.

Everyone wants to get hold of the black book of the Company called “Scylla”. This is where all the important facts are kept and will bring the Company down if obtained by others.

It was surprising to know that Michael’s mom is still alive after living their whole life believing she was dead.