In Supergirl season 3, episode 11, “Fort Rozz,” Kara learned that Reign is not the only Worldkiller. We look at the comics for some clues about who these other figures could be.

‘Supergirl’ preview

Besides “Fort Rozz” revealing that Reign is not alone among Kara’s enemies, a second Worldkiller was awakened at the end of the episode. A woman named Julia was hit by a drunk driver. Though she should have died, she opened her eyes and pushed the car that hit her away, her eyes flashing.

EW previewed that Julia is a Worldkiller named Purity. Played by Krys Marshall, “Purity is not what anyone expects and their showdown is full of surprises,” Supergirl EPs Jessica Queller and Robert Rovner preview.

Though Julia made her debut in “Fort Rozz,” she and Supergirl will not fight until the February 5 episode, titled “Both Sides Now.” This will also be the last episode before Legends of Tomorrow takes over Supergirl‘s time slot for nine weeks.

In the DC comics

The Worldkillers were created by writers Michael Green and Mike Johnson and artist Mahmud Asrar. They first appeared during Supergirl’s New 52 run in 2012’s Supergirl Vol. 6 #6.

The Worldkillers were biological weapons created by Kyrptonian scientists on Krypton, including Kara’s father, Zor-El. The scientists captured alien embryos and experimented on them in an isolated area of space, away from prying eyes. Their names were dervived from Kryptonian myth.

The Kryptonian Science Council recognized the danger the Worldkillers presented so outlawed them. They were supposed to be destroyed, but Zor-El did not follow through despite his feelings of guilt for being involved in their creation.

Each Worldkiller was imbued with, as Reign says, “A hunger to destroy, a hunger to conquer, and a hunger to discover the planets of our birth. The planets from which the Kryptonians stole us.”

When the Worldkillers awoke, fully formed, the laboratory was abandoned and Krypton had been destroyed. They followed the trail to Earth, where Kryptonian survivors live.

On Earth, they confront Supergirl. Reign is impressed with Supergirl’s strength and offers to let her join them, though Kara obviously refuses. Reign also reveals that only a Worldkiller can kill another Worldkiller.

The surviving Worldkillers are named Reign (bottom), Deimax (left), Flower of Heaven (top), Perrilus (right) and Worldkiller-1 (pictured below in a Diasporan host).

The final Worldkiller, Worldkiller-1, escaped long before the other four awoke. He was a separate experiment created, he says, to empower. He is a parasitic entity that seeks to strengthen alien worlds by culling their weakest links in battle.

He attempts to possess Kara when she is a Red Lantern because she exemplifies his beliefs — becoming stronger through loss — but she eventually succeeds in tossing him into the Sun.

Clues for ‘Supergirl’?

In “Fort Rozz,” Kara seeks out a dark priestess who knows of Reign and the Worldkillers. The priestess tells Kara that others will awaken and unite under Reign. “The power, the pestilence, the purity,” she declares.

Knowing that Purity is the name of one of the Worldkillers, it seems like these are the names of the other Worldkillers in Supergirl. That would make a total of four — evoking the Four Horsemen of the Apocalypse.

These, as noted above, are not the names of the Worldkillers from the comics, though their abilities could line up.

However, based on Julia’s clear surprise at her reaction to her accident, it seems likely all these Worldkillers will be like Samantha, living on Earth with no clue who they truly are.

Though Kara declares at the end of “Fort Rozz” that they need to find the other Worldkillers before Reign does, if the Worldkillers don’t know who they are, that will complicate matters significantly.

Supergirl airs Mondays at 8:00 p.m. ET on The CW.