"Supergirl: Woman of Tomorrow" is based on Tom King's comic book run of the same name. Supergirl, of course, is Superman's cousin, Kara Zor-El. Unlike Superman, she was raised among Krytonians before seeing everyone she knows die and comes to Earth. Gunn described it as "hardcore," but added that Krypton the Superdog will also be involved. Sasha Calle played the titular hero in "The Flash," but she is not officially attached to the project.