Supergirl and the Martian Manhunter are off to Mars in the preview for next week's episode, "From From The Tree."
Supergirl airs Mondays at 8pm EST on The CW starring Melissa Benoist.
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.