 Ernest P. Worrell, he is a bumbling janitor at a bank. Ernest wants to become a clerk in the bank he is working in. Meanwhile, a criminal in the Draccup penitentiary had murdered an inmate and is now in court. This is when Ernest was chosen for jury duty. Unberknownst to Ernest, he is being set up for a dangerous criminal named Felix Nash (who looks a lot like Ernest). Then Nash knocks out Ernest and switches places with him. However, Ernest realizes what is going on and is trying to escape from the penitentiary and stop Nash, who is taking over his job and his life.