The plot makes zero sense but Gretchen has a nice new haircut. Nobody seems too concerned about the massive conspiracy of the Company or the extent of the Company's crimes, all people want is revenge for the Fox River break. People act like jerks, just because they can. Somehow no-one can prove Christina was a baddie. The General and T-Bag are blights on the screen with their ham job acting.
Mahone decides not to betray Michael anymore after Michael says he trusts Mahone. Sara and Gretchen plot to escape by triggering a riot. But Gretchen gets caught and shows growth by letting Sara get away. Michael sacrifices his life to ensure Sara's freedom. People look sad. So Sara is an escaped con for life and Michael is dead. Joy. For some reason there is no police dragnet out looking for Sara.
This was a waste of time.
"We won't hit the baby basket."
"I don't do favours for cons."
"Really, that's not what it says on the bathroom wall."
"I know where the hole is!"