News & Spoilers
CARLOS BERNARD ("24") GUEST STARS; HELEN SLATER RETURNS
Eliza (guest star Helen Slater) throws Alex (Chyler Leigh) and Maggie (guest star Floriana Lima) a wedding shower, which causes Maggie to reach out to her estranged father (guest star Carlos Bernard). Supergirl (Melissa Benoist) joins J'onn (David Harewood) on a personal mission.
Dermott Downs directed the episode written by Jessica Queller & Derek Simon (#303).