The official synopsis of the episode of Supergirl 3.03 “Far From the Tree” premiered October 23.
“Far From the Tree” — (8:00-9:00 p.m. ET) (TV-14, DLV) (HDTV)
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). Original airdate 10/23/2017.