MODOK (also written as M.O.D.O.K.; an acronym for Mental/Mobile/Mechanized Organism Designed Only for Killing) is a fictional supervillain appearing in American comic books published by Marvel Comics.
The first MODOK is a former employee of Advanced Idea Mechanics (A.I.M.), an arms dealing organization specializing in futuristic weaponry, who undergoes substantial mutagenic medical experimentation originally designed to increase his intelligence. While successful, the experiments result in him developing a freakishly overdeveloped head, causing the character's signature look and use of a flying chair for mobility. After the experiments, he rebels against his masters and takes control of A.I.M. Debuting in the Silver Age of Comic Books, MODOK has appeared in over four decades of Marvel continuity and starred in the miniseries Super-Villain Team-Up: MODOK's 11 #1–5 (cover-dated September–December 2008) and a self-titled one-shot issue MODOK: Reign Delay #1 (Nov. 2009).
Source: Wikipedia, "[en.wikipedia.org/wiki/MODOK MODOK]", available under the CC-BY-SA License.