“TWELVE MILLION YEARS TO TWILIGHT.” In 12,000,000 AD, Ace, Rocky and June make a prison break, while Swamp Thing holds back mutants. Back in 1978 Prof is saved from a monster when Red returns, cranks up the lab temperature and cooks the creature, as the Justice League routs the remaining monsters. In the future, the Challs reach the breeder labs and blow them up as Swamp Thing battles the giant Persuader. Lawspeaker—the leader of the rebellion—arrives with the cavalry, his rebel Sky Riders. The Sunset Lords try to destroy the city, but Deadman possesses Rip Hunter to destroy their weapon, and the heroes head home.

12 million years in the future, three of the Challengers break free of captivity, and along with Deadman and Swamp Thing, lead a revolution to free society from the oppression of the Sunset Lords.

While in the present, the remaining two Challengers fight an invasion of monsters from the future.