Villains Non and Indigo are set to return to make an attack against the citizens of the National City in the 19^th episode of "Supergirl," titled "Myriad."

The first of the three promo videos released by CBS and DC Entertainment recently reveals that Non and Indigo are coming back to attack the city through the use of mind control.

According to the clip, "Kara must find a way to free her friends when Non and Indigo use mind control to turn National City's citizens into their own army."

The sneak preview provides fans a first look at former WWE Diva Eve Torres as Maxima.

The first clip also shows Maxwell Lord revealing to Supergirl how he and Cat Grant were able to avoid the mind-controlling powers of Nod and Indigo.

The second promo video features a blonde-haired Alex, accompanied by a young boy, showing up in front of Sylvia Danvers. Based on the clip, it looks like the young boy is actually Martian Manhunter pretending to be somebody else.

The third and last clip shows Supergirl arriving at the Fortress of Solitude in hopes of finding Superman. She also wants Kelex to tell her what Myriad actually is.

Actress Melissa Benoist leads the cast as "Supergirl," alongside  Laura Benanti as Alura/Astra, Jenna Dewan-Tatum as Lucy Lane, Chris Vance as Non, Peter Facinelli as Maxwell Lord, Laure Vandervoort as Indigo, Briana Venskus as Agent Vasquez, Glenn Morshower as General Sam Lane, and Dr. Eliza Danvers as Helen Slater.

"Supergirl" airs every Monday, 8:00 P.M. on CBS.