BEWARE: ACTUAL SPOILERS IF YOU HAVEN'T SEEN ALL SEASONS: "Captain Jack is the Face of Boe. Captain Jack cannot die. Captain Jack was once a Time Agent, or pretends to be one. Captain Jack wears a vortex manipulator. Dorium Maldovar sold River a vortex manipulator “fresh off the wrist of a handsome Time Agent.” Dorium Maldovar works with the Headless Monks from time to time. The Headless Monks decapitate people. The Face of Boe is a head with no body." Vortex Manipulation, Dorium Maldovar, The Face, Doctorwho, Doctors Who, Dr. Who, Face Of Boeing, Captain Jack, Headless Monk
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Captain Jack cannot die. He was once a Time Agent who was born on the Boeshane Peninsula. He wears a vortex manipulator and Dorium Maldovar sold River a manipulator "fresh off the wrist of a handsome Time Agent." Dorium works with the Headless Monks, who decapitate people. This explains how Captain Jack no longer has a body. He is the Face of Boe.