Not much it is known for Monitor but at Season 11 of Smallville we learn that the Monitors are entities that caused the Crisis that destroyed Earth-2. Their purpose is to end all existence so they can maintain order.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.