Unexpected#113(1969)

Johnny Peril finds himself incarcerated at the hands of a maniacal judge and executioner. He is accused of selling government secrets to a foreign power but the executioner promises him leniency if he hands over the documents. Peril remains steadfast that he will keep the location of the documents to himself and he is swiftly chained in a medieval type dungeon. While he is incarcerated, Peril meets a couple of other inmates who are also awaiting judgement. Peril confesses that he is not actually a criminal but rather he is working undercover to find out what happened to missing criminals that have a secret stash waiting on the outside. Peril breaks loose from his confinement and overpowers his guards. He escapes to the outside world using a mysterious door and finds himself in the middle of a swamp area. He subdues his pursuers and takes the executioner and his men into custody. The executioner had been a fanatic about justice but he was also greedy. He only spirited away criminals that had hidden loot somewhere. Once he obtained information on the hidden loot, he would release the criminals into the swampy area and hunt them down.