Monkeyman and O'Brien is an American comic book series created by artist Art Adams in 1993. The series was published from 1993 to 1999 by Dark Horse Comics in various types of installments including short features in anthologies, backup stories in other series, a three issue limited series, a two issue crossover series and a comic strip in the promotional newspaper Dark Horse Extra. In 1997, a trade paperback collection of the five comic issues was published.
The series follows the story of Ann O'Brien, the daughter of a missing scientist, who at the time of his disappearance was working on experiments in interdimensional travel. When one of her father's experimental machines was accidentally activated by Ann, it teleported from another dimension Axwell Tiberius (a.k.a. "Monkeyman"), a 10-foot-tall (3.0 m) super-intelligent gorilla-like being that Adams conceived as "the Reed Richards of the gorilla world". The same accident also bathed Ann in a mysterious radiation which caused her grow to seven feet tall and endowed her with superhuman strength, endurance and speed. Axewell quickly became Ann's friend and the two went on to face numerous Silver Age–style threats including the "Shrewmanoid" and the "Froglodytes". The duo also encountered the Image Comics super-team Gen¹³. In the last Monkeyman and O'Brien stories published to date, humorous situations arise between the pair such as O'Brien growing to colossal size after being hit by one of Monkeyman's experimental devices. Monkeyman's brother Nonny O'Brien also features in the series.