Ritual Trial of Endurance (a Lantern must attempt a dangerous passage through the Anti-Matter Universe)

Ronnie and Jason quickly notice, after defeating an hive of Shadow Demons, that the universe was not destroyed as they thought but they were actually transported to the Anti-Matter Universe.

The fifth Insect Queen is a former member of the Justice Underground, a team of heroes who oppose the Crime Syndicate of America in DC's Anti-Matter Universe.

The Justice Underground is an alternative version of the Secret Society of Super Villains from the Anti-Matter Universe.

Robin, along with the Huntress died while protecting innocents at the hands of shadow demons from the Anti-Matter Universe.

Doctor Fate realised Anti-Matter Man was an explorer from the Anti-Matter Universe, and regarded what had happened to him as odd hazards of Warp-Spae he must overcome to reach his destination.

Originally, the experiment splintered the Universe into the Multiverse and created the evil Anti-Matter Universe of Qward.

The character was revived in the 1990s as a villain from the "Anti-Matter Universe", rather than being from Earth-Three.

There is an evil counterpart to the Great Ten in the Anti-Matter Universe, known as "The Most Unworthy Ten".

At this same moment, the Anti-Matter Universe is created, unleashing evil into the cosmos; thus, the Monitor and the Anti-Monitor are born.