On January 19th, 2015, /u/Cyber85 asked the following on /r/DCcomics:
Can someone explain who the ant monitor is? I keep seeing that name pop around when I read comics.
The Ant!
Oh man – I love that people are asking about the Ant! He was a villain of the Teen Titans back in 1966! He was a thief so I guess he had to monitor stuff and…
Oh, you meant the Anti-monitor. Well, he’s (it’s?) cool too. Here’s what you need to know. :)
On September 15th, 2014, /u/mateogg asked the following on /r/DCcomics:
How does the Anti-Matter universe fit in the multiverse? is it just one of the 52? or is the Matter-Antimatter pair one universe from this perspective?
It has nothing to do with the Earth-3 universe, right?
Crime Syndicate of Amerika
Oh man, I love this question. OK kids, this is where it gets complicated…
Krona
Originally the antimatter universe was created billions of years ago by Krona, basically a renegade Gaurdian from before they were the Gaurdians who’s been screwing stuff up since, including in Brightest Day. Anyway:
Billions of years ago, a Maltusian scientist named Krona, performed a forbidden experiment in an effort to see the origin of the universe. His irresponsible actions disrupted the process of cosmic creation, resulting in an additional, opposite universe.
Ask the DC Multiverse Historian 