The Prisoner Juggernaut is a large, muscular monster that is seen in Silent Hill: Downpour. In the first encounter with this monster in Overlook Penitentiary, it is seen ripping off a metal gate so that it can engage Murphy Pendleton. In addition to being encountered in standard monster fights, they can reach through cell bars to grab Murphy as he passes. They are dominant to the smaller Prisoner Minion. On one occasion, a Prison Juggernaut leads two Minions around on meat hook "leashes" like dogs.
Juggernauts look very similar to the smaller Minions, appearing as pale-skinned humans with tattoos covering their bodies and their faces twisted into permanent grins. They lack the metal contraptions of the Minions, but have barbed wire wrapped loosely around their midsections and tightly around their arms instead. It appears that this barbed wire is threaded into their faces as well, keeping their expression frozen and leaving deep indentations in their flesh. True to their name, Juggernauts are huge and inhumanly strong, with muscular physiques.
The Juggernaut only appears in scripted encounters toward the end of the game in Overlook Penitentiary. This imposing enemy uses his devastating charge attack to get into melee range; then he follows up with a series of powerful strikes. Juggernauts also have an enormous amount of stamina, able to absorb huge amounts of damage from melee strikes and firearms alike. They also frequently ignore attacks, shrugging them off and following through with their own attacks.
When facing a Juggernaut, it's best to dodge its charge. Land a few hits while the enemy turns to face Murphy, then use basic melee tactics; block the Juggernaut's strikes and counterattack when finding an opening. However, it is advised that the player use firearms or flee.
The Juggernaut could represent Murphy's fear of the other inmates, or even the inmates themselves, as many, if not all of said inmates could kill or attack Murphy without a second thought while he was in Ryall State Prison. The fact that they appear to have what look like tattoos or prisoner identification numbers on their bodies seems to support this.
Both variations of the Prisoner monsters may represent elements of Murphy's personality that have changed due to his time in prison. The Juggernaut specifically represents a fear Murphy may have developed of himself, and the crimes he had committed. It shows a change in his self-image to something more monstrous, and his aversion to them is symbolic of his pent up remorse for his crimes.
Their aggression, strength and dominance could also be a part of their symbolism, as there are cons in every prison who swing some weight by striking deals with other inmates, or with corrupt guards such as George Sewell, in exchange for protection or special favors (e.g. Sewell allowing Pendleton access to Patrick Napier in the sequestered prison shower) which could be symbolised by their pervasiveness, their ability to rip cell doors off hinges, and especially the scene where one Juggernaut is literally holding two Prisoner Minions on a leash.
- Killing or incapacitating 10 Prisoner Juggernauts unlocks the Achievement/Trophy "The Bigger They Are...".
- The Juggernaut is voiced by Martini Skipp.
- In Overlook Penitentiary, while chasing Murphy, the Prisoner Juggernaut grabs an electrical wire, which shocks it and makes it fall to its death.
- The Juggernaut takes a lot of punishment to kill with Murphy, but dies in one swing from the Bogeyman. In addition, Murphy does not run into enough of the Juggernaut enemy to get the trophy, forcing the player to get it via the Bogeyman.
- A monster similar in appearance to the Prisoner Juggernaut briefly appears in Silent Hill: Revelation during the Otherworld sequence in Central Square Shopping Center.