A previous Supergirl movie was produced back in 1984 with Helen Slater playing the title role.
According to Deadline, Warner Bros. Pictures and DC Films are in the process of developing a movie that will center around Superman’s cousin, Supergirl.
There is no official word yet on who’s going to be the director of the Supergirl film, but the outlet says the studio will likely seek out a female director.
Because they’re both from the same planet, Supergirl and Superman have a similar power set and the same vulnerability to Kryptonite.