Brit Morgan's Livewire hasn't lost any of her menacing power in new images from Monday's episode of "Supergirl."

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In "We Can Be Heroes," the supervillain sets off sparks in her return to National City, creating serious problems for Kara and Mon-El. After all, as David Harewood's J'onn J'onzz warned in the episode promo, "She brings death and destruction."

However, as we see from the synopsis, Livewire may be only the beginning of the problems for the city's heroes:

After Livewire (guest star Brit Morgan) seemingly breaks out of prison, Supergirl (Melissa Benoist) is intent on recapturing her. After training Mon-El (Chris Wood), Supergirl takes him with her when she sees Livewire attack the NCPD but things go awry when Mon-El puts Supergirl before the citizens of National City. Meanwhile, James (Mehcad Brooks) decides to come clean with Kara and M’Gann (guest star Sharon Leal), has a psychic attack and collapses into a coma.

The episode also features a guest appearance by Sharon Leal as M'Gann, aka Miss Martian.

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