Krys Marshall as Purity
Worldkiller Purity (Krys Marshall) attacks National City’s subway tunnels in Season 3, episode 13 of CW’s “Supergirl.” The CW

The Girl of Steel faces off with another Worldkiller in next week’s episode of “Supergirl.”

According to the synopsis for Season 3, episode 13 of the CW series, the DEO captures a second Worldkiller named Purity (Krys Marshall). In the hopes of finding out how to defeat Reign (Odette Annable), Supergirl (Melissa Benoist) and Alex (Chyler Leigh) use different methods of interrogation with Purity (Odette Annable). However, Purity escapes and attacks National City’s subway tunnels.

The trailer for the episode suggests that Purity manages to get out of the DEO after attacking Supergirl, who seems to be trying to get information about Reign from her. “You want to hurt me because you’re hurt. You want me weak because you’re weak. Someone cuts something out of you and you feel the hole every day,” Purity tells Supergirl before using her superpowers on her. “I am the word of justice. The scalding light. I am Purity.”

In a recent interview with Entertainment Weekly, “Supergirl” executive producers Jessica Queller and Robert Rovner said that the episode is a big one. “This an exciting episode where we see Supergirl face off with the second Worldkiller, Purity, played brilliantly by Krys Marshall,” Queller and Rovner teased of the hour. “Purity is not what anyone expects and their showdown is full of surprises.”

Purity, aka Julia Freeman, first appeared in Season 3, episode 11. At the end of the said episode, Julia and her friend were walking down the street when a car came barreling along. The car pinned Julia to a parked vehicle. Julia should have been crushed, but she easily pushed the car off of her body and stood up like nothing happened.

Elsewhere in the next episode, J’onn (David Harewood), Winn (Jeremy Jordan) and Mon-El (Chris Wood) band together to fix the Legion ship.

“Supergirl” Season 3, episode 13, titled “Both Sides Now,” airs on Monday, Feb. 5 at 8 p.m. EST on The CW. The installment marks the show’s final episode before its long hiatus. “Legends of Tomorrow” will take over “Supergirl’s” time slot for nine weeks starting Feb. 12 until April 9. “Supergirl” returns on April 16.