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My approach is to combine a rigorous scientific method while keeping an absolutely open mind. So much has been closed off to us simply because people assumed they already knew the answers.— Jack Cabot

Jack Cabot is a scientist living in the Cabot House in Boston in 2287.


Jack is the son of archaeologist Lorenzo Cabot. In 1894,[1] his father led an expedition to the Rub' al Khali in search of the fabled Ubar civilization.[2][3] After Lorenzo returned to Boston from the Middle East with an alien artifact, he was found to have been granted supernatural abilities, yet also been rendered insane by the effects of the crown.[4] For the safety of both Lorenzo and those around him, Jack, as superintendent, imprisoned the archaeologist along with his artifact at Parsons State Insane Asylum in 1898.[5]

Jack devoted his life to investigating the artifact. His studies into the mysterious object subsequently resulted in the development of a serum derived from his father's blood that defied aging, halting and even reversing the process. In turn, Jack's special serums granted him and his family the ability to live for more than four hundred years.[3][6] More than two centuries after the Great War, he continues to live in Cabot House with his mother and sister, furthering his research into a cure for his father's insanity.

Interactions with the player character

Interactions overview

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This character is essential. Essential characters cannot be killed.
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This character is involved in quests.

Effects of player's actions

Other interactions

  • If the player character immediately leaves after speaking with Deegan in the quest Special Delivery, Cabot may start following them across the Commonwealth. He will return to Cabot House once spoken to.
  • After receiving the artifact gun from Jack, if the player character chooses to ask what Jack will do now, Jack will say he will travel to the Southwest. His father was always convinced that there was another alien city buried somewhere below the Mojave Desert.
  • Should Jack survive, one may randomly encounter him in the Commonwealth with Deegan. If asked about his presence there, he will explain his desire to explore the world around him. Subsequently, he will offer to buy fiber optics from the player character, although he has only a small amount of caps on him. If asked as to the reason he needs them, he will only state that the public is not quite ready for his experiments.


Apparel Weapon Other items
Cabot's lab coat Laser pistol Stimpak


  • Siding with Jack will cause him to permanently stay in the Parsons Asylum basement unless the player character decides to free Lorenzo before killing him.
  • Some in-game time later, Jack's appearance may change drastically (like his sister's) and he will appear old. He may also comment on his mother's death, mentioning that she could not survive long without the serum.
  • At one point, Jack Cabot will guess the Sole Survivor's age as at least 200 years old.


Jack Cabot appears only in Fallout 4.

Behind the scenes

The Cabot family is based on the real world Cabots, one of the "first families of Boston."



  1. Lorenzo Cabot's journal
  2. Jack Cabot: "My father excavated a city in the Rub'al Khali in Arabia which he dated to more than 4,000 years before the rise of any known human civilization. The structures and artifacts were... strange. Disturbing, even. Clearly not constructed for or by humans. I've spent my life trying to decipher what he uncovered."
    (Jack Cabots's dialogue)
  3. 3.0 3.1 Jack Cabot: "One of the effects of my father's illness was a slowing or arresting of the aging process. So, yes... he is well over 200 years old, as you suspected."
    (Jack Cabots's dialogue)
  4. The Sole Survivor: "You really are insane, aren't you?"
    Lorenzo Cabot: "Perhaps by the old definitions. But things have changed while I've been locked away. The old rules no longer apply."
    (Lorenzo Cabot's dialogue)
  5. Jack Cabot: "My father is... confined in Parsons. For his own safety and everyone else's."
    (Jack Cabots's dialogue)
  6. Jack Cabot: "I don't share your pessimistic view. I still believe that human civilization has a chance to regain its lost glories. This is one reason I'm so passionate about my work. If I can learn the secrets of the ancients, perhaps we can avoid their fate."
    (Jack Cabots's dialogue)