In ‘JLA/WildC.A.T.s.’ (1997), the JLA and WildC.A.T.s. crossover for the first time. The issue begins with Kid Flash – Wally West, who is to become the Flash – meeting Epoch for the first time. Kid Flash attempts to combust Epoch’s feet by vibrating the air molecules with his fingers. However, Epoch’s armor is 41st century technology.

When Epoch is about to kill Kid Flash, the JLA shows up. Flash wrests all the projectiles at superspeed. Epoch comments that the team has taken control of his Chrono-Cube. Claiming to be a 4D man, Epoch reaches billions of years into the future, and hits Superman with red solar energy. Being a being of pure energy now, Superman survives the attack unscathed. Epoch disappears vowing to destroy the superheroes’ ancestors in the past.

The JLA battle Epoch across the timestream. In 14,000 B.C., Green Lantern saves a distant relative from Epoch. When Flash attempts to reach him, Epoch says his advanced technology makes him slow down to a crawl. In 65,000,000 B.C., at the time of the dinosaurs’ extinction, Epoch encounters a soliton that enhances his armor and enables him to steal the Chrono-Cube as power source.

The JLA end up in 33 AD. Meanwhile, Superman and Green Lantern scan the Earth for the power source and discover it buried in limestone. Then, the JLA activate the drive mechanism with Green Lantern’s power ring focusing all their willpower. They end up transported to the Wildstorm Universe.

Eventually, Superman and Mister Majestic are able to settle their differences. The JLA/WildC.A.T.s. teams-up to dispatch the Seven Deadly Sins that had been destroying the Wildstorm Universe. During the battle, Mister Majestic agrees with Void to help return the Justice League home otherwise both universes will be destroyed.

Void takes Green Lantern into voidspace. There, she determines Epoch’s dark nova cracked time “into two parallel waves; two separate histories were created.”¹ Void explains the JLA’s technology brought them to the wrong time: to the WildC.A.T.s.’ 1997. In order for the entities in voidspace to help, Green Lantern must teach them how to create light constructs. Using her technology, Void is able “to punch a hole through voidspace. A bridge.”¹

The JLA and WildC.A.T.s. travel back to the DC Universe. There, the JLA find out they have been away for five days. The heroes find Epoch has merged with the Omega Attractor, a living computer and bomb from the 68th century. With the Omega Attractor, Epoch has access to weapons across centuries. He uses it to deploy weapons to enslave the world and imprison superheroes on the moon. His plan is to turn Earth “into a vast time-traveling time engine powered by its human slave population.”

The JLA and WildC.A.T.s. team-up to take down Epoch’s citadel. Superman tells Maul his plan. He tells Maul to grow large enough to take down the citadel. In fact, to account for Maul’s mindlessness, a burst of electricity to the right motor neurons should return Maul to his normal size within 30 seconds. Maul succeeds. Since the WildC.A.T.s. are not in Epoch’s database, Superman sends them to take him down. Meanwhile, the JLA are working on the Chrono-Cube. Eventually, Epoch is defeated. The JLA program the Chrono-Cube to create a temporal prison cell around Epoch. Finally, the WildC.A.T.s. return home.