In its second season, "Supergirl" is strengthening its ties to DC Comics mythology, not only with appearances by Tyler Hoechlin as Superman but through the introduction of characters like Lena Luthor, Mon-El, Maggie Sawyer, Snapper Carr and Miss Martian.

RELATED: Cat Grant Loves to Watch Clark Kent Walk Away in New "Supergirl" Scene

The latter, played by Sharon Leal, takes center stage in the synopsis for the Oct. 31 episode, "Survivors," which brings Kara and Alex to an alien fight club operated by Roulette (Dichen Lachman of "Marvel's Agents of S.H.I.E.L.D."), a character also rooted in DC Comics.

HANK AND M’GANN GET TO KNOW EACH OTHER; AN ALIEN FIGHT CLUB RUN BY ROULETTE GRABS SUPERGIRL’S ATTENTION — When Kara (Melissa Benoist) and Alex (Chyler Leigh) investigate the murder of an unregistered alien, the trail leads to an alien fight club run by Roulette (guest star Dichen Lachman), the ringmaster who commands aliens to fight in mortal combat for the entertainment of rich humans. While trying to stop the fighting, Supergirl and Martian Manhunter find themselves up against a surprising opponent. Meanwhile, Hank (David Harewood) is thrilled to have found another Martian and tries to get to know M’Gann (guest star Sharon Leal) better. Supergirl takes Mon-El (Chris Wood) under her wing and begins to train him. James Marshall directed the episode written by Paula Yoo & Eric Carrasco.

A fan-favorite superheroine, Miss Martian (aka M'gann M'orzz or Megan Morse) debuted in 2001's "Teen Titans" #37 as a White Martian who escaped the civil war between her people and the Green Martians. She gained popularity on the animated series "Young Justice," and has appeared in the video games "Young Justice: Legacy" and "LEGO Batman 3: Beyond Gotham."

Sharon Leal
Sharon Leal

As the "Survivors" synopsis suggests, Hank, aka Martian Manhunter, will try to foster a relationship with M'Gann as the season unfolds.

"J’onn is suddenly going to have this connection to Mars that he’s been lacking for the last 300 years,” Executive Producer Andrew Kreisberg recently said. “He’s dealing with survivor’s guilt, and he’s spent the last few hundred years burying that. It’s only because of his interactions with Kara and his deepening relationship with Alex that he gets to start to tap back into that. The arrival of Miss Martian is really going to open the flood gates.”

Airing Mondays at 8 p.m. ET/PT on The CW, “Supergirl” stars Melissa Benoist, Mehcad Brooks, David Harewood, Chyler Leigh, Jeremy Jordan and Calista Flockhart.