Nimdok is a major character in the late Harlan Ellison's 1967 horror short story I Have No Mouth, and I Must Scream.

While his story remains mysterious in the short story, in the game, he is revealed to be a former Nazi scientist who has conducted numerous experiments on Jewish patients to find the secret of eternal youth.

It's revealed that Nimdok is actually a Jew himself, having sold out his family to the Nazis in exchange for his life and liberty in continuing his experiments. Like Mengele, Nimdok survived the war and went into hiding in Brazil until AM came to power.

As one of the few survivors of the apocalypse, Nimdok was tortured relentlessly by AM; however, AM also felt a twisted sort of kinship with the retired scientist, and eventually set out to restore Nimdok's ailing memory and encourage him to continue his experiments.