World's Most Dangerous Prisoners

Following the crimes and incarceration of James 'Porky' O'Rourke's, including when he committed murder at age 22 by dropping a slab of concrete on a mans head. The episode documents his time in prison, such as his attacks on prison officers, stabbing the governor in the exercise yard and strangling a fellow inmate.

Exploring the life and convictions of Joanne Dennehy. After serving a short sentence in Peterborough prison, she committed a frenzied knife attack on a man she lured back to her apartment with the promise of sex. Whilst on the run from police, Dennehy proceeded to violently stab and murder two more men over the next 10 days, before stabbing two men out walking their dogs.

Mark Hobson is a man with an extreme propensity for violence; a notorious British spree killer who murdered twin sisters, as well as an elderly couple in their own home.

Following the crimes of Jaime Osuna, such as the metal and physical abuse he inflicted on his ex-wife, as well as the torture and murder of a mother of six who resembled his ex-partner. Awaiting trial, he began practicing Satanism and attempted to kill a fellow inmate.