Felix Nash

Felix Nash is the central antagonist of Ernest Goes To Prison and despite the comedic nature of the Ernest series he was actually a rather fearsome adversary, though like most comedy villains he was defeated by the titular Ernest and made to pay for his many crimes.

History
Felix Nash was a convicted crime lord on death row who also happened to look identical to Ernest, this would allow Felix to come up with a plan to switch places with Ernest and evade death row while having Ernest falsely imprisoned so as to fool the guards into believing Felix was still in prison.

As Ernest tried to reform the prisoners in his own eccentric (but well-meaning) way Felix proceeded to try and life Ernest's life but was angered at the way people dismissed him and believed he was doing Ernest a favor when he started commiting mean-spirited acts and criminal behavior that alienated him from Ernest's friends.

Ultimately Felix masterminded a plan to rob Ernet's own employers, who just so happened to be a rather prominent bank - yet one of Felix's own henchmen grew attached to Ernest and felt guilt over letting an innocent man die just so Felix could further his own criminal lifestyle, which ultimately resulted in Ernest escaping prison and engaging Felix in a battle in the bank.