Nimrod (Marvel)

Nimrod is a supervillain from the X-Men franchise and a unique Sentinel from an alternate-future who travelling to the past and became a recurring opponent to the X-Men as well as their allies.

Nimrod exists to hunt down and exterminate mutants, just like the Sentinels of the modern-era, however he is much smaller than the current Sentinels (which tend to be large and fairly clumsy-looking constructs): despite his smaller size Nimrod is much more advanced than his larger cousins and is capable of fighting the entire X-Men by himself.

Nimrod has appeared in several media outwith the mainstream comic books, most famously he was one of the antagonists of the early X-Men cartoons.