Supergirl Welcome to Earth has Supergirl joined by Wonder Woman. Alas, its not the Gal Gadot Wonder Woman but rather its Lynda Carter who makes her long awaited debut in this episode. Carter plays POTUS, i.e. President of the United States.
There are hints of Mon-el being the bad guy that launches an attack on POTUS and it all being somehow linked to the Martian Manhunter. There is also the briefest tease about Miss Martian.
Here’s the synopsis from the episode Supergirl Welcome to Earth:
“Supergirl Welcome to Earth”— (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)
LYNDA CARTER (“WONDER WOMAN”) LANDS IN NATIONAL CITY AS PRESIDENT OLIVIA MARSDIN — An attack is made on the President (guest star Lynda Carter) as hot-button, alien vs. human rights issues heat up in National City. Supergirl (Melissa Benoist) and the DEO are assigned to protect the President and bring in the responsible party. Alex (Chyler Leigh) teams up with Detective Maggie Sawyer (Floriana Lima) to investigate the case while Kara searches for a recently escaped Mon-El (Chris Wood), who she fears may be the alien behind the assault. Rachel Talalay directed the episode written by Jessica Queller and Derek Simon (#203). Original airdate 10/24/2016.
Melissa Benoist as Kara Zor-El/Supergirl
Mehcad Brooks as James ‘Jimmy’ Olsen
Calista Flockhart as Cat Grant
Chyler Leigh as Alexandra ‘Alex’ Danvers
Jeremy Jordan as Winslow ‘Winn’ Schott
David Harewood as J’onn J’onzz/Martian Manhunter
Jenna Dewan-Tatum as Lucy Lane
Peter Facinelli as Maxwell Lord
Helen Slater as Dr. Eliza Danvers
Dean Cain as Jeremiah Danvers
Laura Vandervoort as Indigo
Floriana Lima as Maggie Sawyer
Chris Wood as Mon-El
Ian Gomez as Snapper Carr
Katie McGrath as Lena Luthor
Lynda Carter as the President Olivia Marsdin
Tyler Hoechlin as Clark Kent/Superman