*Series One Monitor
I got this guy so cheap- about eight bucks (shipping included)! He was a major player in the story, but valued less than the more popular characters in the line. He does look like a freak, but makes a FUN toy.
Thirteen billion years ago, the multiverse was born due to tampering with the creation of the universe by Krona, a scientist from the planet Maltus who was attempting to see the beginning of the universe. As a result of his actions, an infinite number of parallel universes were brought into existence side by side, separated only by minuscule vibrational differences, none of them as strong as the single universe that existed earlier would have been.
Monitor was born on Oa's moon, apparently as the living embodiment of all positive matter universes. One of these universes was composed entirely of antimatter, and on the moon of Oa's counterpart, Qward, a hideous mockery of life was born from its very soil, a being that would come to be known as the Anti-Monitor.
I can't think of a more seminal tale of good versus evil than the story of the Monitor and Anti-Monitor... told in many ways, among many cultures, the titanic nature of the idea translated in a unique way within the realm of the art comics.