The episode will serve as the opening chapter in the musical crossover between Supergirl and The Flash, with a guest appearance by Glee's Darren Criss as the Music Meister. It also appears to be the official debut of Teri Hatcher and Kevin Sorbo's mysterious characters, who have been reported to have a multi-episode arc on the show.
Hatcher's return to the Super-verse should be a welcome surprise to fans of her role as Lois Lane in the 90s ABC drama Lois & Clark: The New Adventures of Superman.
Check out the synopsis below:
TERI HATCHER ("DESPERATE HOUSEWIVES," "LOIS & CLARK: THE NEW ADVENTURES OF SUPERMAN") AND KEVIN SORBO ("HERCULES") GUEST STAR; DARREN CRISS ("GLEE") MAKES HIS DEBUT AS THE MUSIC MEISTER
A new villain (guest star Teri Hatcher) comes to National City, putting Supergirl (Melissa Benoist) on high alert. Meanwhile, Winn's (Jeremy Jordan) girlfriend, Lyra (guest star Tamzin Merchant), gets Winn in trouble with the law. Maggie (guest star Floriana Lima) attempts to help Winn but old loyalties get in the way. The Music Meister (Darren Criss) attacks Supergirl.
John Medlen directed the episode written by Katie Rose Rogers & Jess Kardos (#216). Original airdate 3/20/2017.
Supergirl airs Monday nights at 8 p.m. ET/PT on The CW.