Supergirl -- “I Believe In A Thing Called Love” -- Image Number: SPG617fg_0019r -- Pictured (L-R): Peta Sergeant as Nyxly and Jon Cryer as Lex Luthor -- Photo: The CW -- © 2021 The CW Network, LLC. All Rights Reserved.

Supergirl episode photos show that Lex Luthor is back and he’s working with Nyxly.

Supergirl episode 617, “I Believe In A Thing Called Love,” will also see Alex trying to plan the perfect proposal.

LEX RETURNS — When Lex Luthor (guest star Jon Cryer) appears by Nyxly’s (Peta Sergeant) side, Supergirl (Melissa Benoist) and team must deal with the emotional fallout of facing their two biggest foes at the same time. Alex (Chyler Leigh) makes plans for the perfect proposal to Kelly (Azie Tesfai), but work keeps getting in the way.

Supergirl episode 617 airs on Oct. 26, 2021.

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