Note: According to the book of Genesis from the Hebrew tradition, Nimrod was a great hunter and the first king to establish a domain after the flood survived by Noah. The most famous story of Nimrod tells of his building of the Tower of Babel and God's subsequent punishment for Nimrod's hubris.
|Nation or Planet of Origin|
Note: Nimrod was created at an undisclosed location in the continental United States of the early 21st Century of the alternative reality Earth-811.
|Base of Operations|
Highly advanced form of Sentinel with mechanically superior strength, speed, stamina, endurance, senses and intelligence; capable of assuming human form, detecting superhuman abilities in humans, project various forms of concussive energies, manipulate the electromagnetic spectrum and teleport through time and space.
|Uncanny X-Men #191 (March, 1985)|
|Chris Claremont & John Romita Jr.|
In the early 21st Century of an alternative reality, Sentinel robots have taken control of the United States to carry out their programming to eliminate the alleged menace posed by mutants, succeeding in either killing or imprisoning all known superhumans - mutant or not.
When the X-Men, Katherine Pryde (Ariel) and Rachel Summers (Phoenix) attempted to sabotage the Nimrod Project facilities, they were pursued and trapped in a laboratory. Activating a post-hypnotic suggestion, Pryde compelled Summers to travel back in time to an era before the Sentinels ruled - but instead of her own past Summers traveled back to a reality not her own. Intent upon destroying the threat posed by Summers, the Sentinels sent their most powerful creation back in time - the mutant hunter known as Nimrod.