Not The Only Super (Supercorp and Sanvers)

Cadmus is gone and Kara finally gets the break she deserves. Break as in... fighting non-supercharged aliens and no psychotic anti-alien cults getting involved. But that break cuts short when a mysterious woman lands in National City. Who is this woman and why does Kara thinks she looks so familiar.

Set after season 2.

Disclaimer: I own nothing.