MODOK or M.O.D.O.K. (Mental Organism Designed Only for Killing) is a villain of the Marvel universe that first appeared in the comic Tales of Suspense #93. Initially it was a recurring super-villain of the hero Captain America.
MODOK’s real name was George Tarleton, a technician of an organization called Advanced Idea Mechanics (AIM). In order to find a way to understand an object called Cosmic Cube, a cube with great power and energy, this organization technicians conducted a series of experiences using a mutagenic. Tarleton mutated and became MODOK. This creature was supposed to help AIM to understand the cube, but it became ambitious and killed those who created him and took control of the AIM organization.
The following vido explains everything with great detail.
In the world of LEGO, MODOK only appears in one set of 2014, 76018: Avengers: Hulk Lab Smash with figures like Hulk, Thor, Falcon and the villain Taskmaster.
The figure has the common body of a LEGO minifigure. The big distinctive part is the Head, a huge piece totally custom. If the head has good detail and is represents well the minifigure, the body is disappointing. Beside its different color scheme, it has no detail which reflets the worth of the minifigure, about $5. It worths for being the unique version of the minifigure in the LEGO universe.