The CW has released the synopsis for episode #310 of Supergirl, which you can check out below. The installment, titled “Legion of Superheroes,” is officially described as follows:
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MEET THE LEGION – Struggling to heal from her injuries inflicted by Reign (Odette Annable), Supergirl (Melissa Benoist) remains in a dreamlike state, unable to be reached. Mon-El (Chris Wood) recruits one of the Legion members, Brainiac-5 (guest star Jesse Rath), to try to bring her back. Meanwhile, Reign continues her rampage on the city so the DEO teams up with the Legion of Superheroes to try to stop her.
Supergirl, “Legion of Superheroes,” was directed by Jesse Warn and written by Derek Simon & Eric Carrasco. The episode airs Monday, January 15, at 8pm on The CW.