This cybernectic, helmet-looking breathing respirator belonged to Kabal, member of the crime syndicate known as the Black Dragon clan. Kabal's Helmet first appeared along with him in Mortal Kombat 3, and has been shown throughout the Mortal Kombat series. It later reappeared as another collectible Relic called Kabal's Mask within the Konquest mode of Mortal Kombat: Armageddon.
This respirator helps Kabal breathe due to injuries sustained by Shao Kahn's Extermination Squads years ago when the Konqueror's invasion of Earthrealm began.
Kabal's trademark helmet has taken a whole new look in Mortal Kombat (2011), as Kabal was forced to still wear this life support system for the rest of his life after the injuries sustained by Kintaro by being burned alive.
Kabal along with his helmet, made an appearance in the animated cartoon series Mortal Kombat: Defenders of the Realm, in which he betrayed Kano and the Black Dragon clan and befriended Sonya Blade, after she expressed disgust over the prejudice he faced throughout his days due to his disfigurement.
In a flashback from his previous life, Kabal was originally human before his horrible and unjust disfigurement.
Kabal forever wears his respirator helmet
Kabal with his reshaped helmet in Mortal Kombat (2011)
Kabal with his trademark helmet in Mortal Kombat: Defenders of the Realm
Kabal's original form in Mortal Kombat: Defenders of the Realm
Kabal removed this helmet and unraveled his scarred face in Mortal Kombat: Defenders of the Realm
Kabal now teams up with Sonya Blade in spite of his unfortunate injury