"Duet" is the seventeenth episode of the third season of The CW television series, "The Flash", which aired on March 21, 2017, the  story begins at the end of the "Supergirl" episode ,"Star-Crossed" on March 20, 2017, which sees Kara Danvers / Supergirl (Benoist) being put in a coma by Music Meister, with who (Chris Wood), Lar Gand, and alternatively as Valor and M'Onel), is a fictional superhero appearing in American comic books published by DC Comics, commonly in association with the Legion of Super-Heroes, Superboy, and Superman, is primarily known as who?
Lar Gand Lar Gand, known primarily as Mon-El (and alternatively as Valor and M'Onel), is a fictional superhero appearing in American comic books published by DC Comics, commonly in association with the Legion of Super-Heroes, Superboy, and Superman. The character has been reinterpreted over the years, but in all versions, he serves as a hero with abilities similar to those of Superman, sometimes serving as a substitute for him.
Chloe Sullivan Chloe Sullivan is a fictional character in the television series "Smallville", which is based on the Superman and Superboy comics published by DC Comics. Portrayed by series regular Allison Mack, the character was created exclusively for "Smallville" by series developers Alfred Gough and Miles Millar. Other than main character Clark Kent, Chloe is the only main character to last the duration of the show, though Mack only signed on for five episodes in the tenth and final season. The character has also appeared in various literature based on "Smallville", an internet series, and was then later adapted back into the original Superman comics which inspired "Smallville".