CW | 8:00 pm

A beloved television Wonder Woman — Lynda Carter — guest stars in "Welcome to Earth" as President Olivia Marsdin, targeted in an attack as emotions run high in National City over the debate on alien vs. human rights. Supergirl (Melissa Benoist) and the DEO are assigned to ensure the chief executive’s further safety and bring in those responsible. Privately, Kara frets that the recently escaped Mon-El (Chris Wood) may be the alien behind the assault.