Alex is the confident foster sister of Kara. Fascinated by Kara’s powers from a young age, Alex developed a lifelong obsession with science which inspired her to become a doctor.
Plus she has L-E-X in her name, so you know she’s going to be bad, right?
Leigh joins Melissa Benoist, Mehcad Brooks, Laura Benanti, David Harewood, and Calista Flockhart in the pilot, which is set to start filming in Los Angeles soon.
You can read some more Supergirl news that came out today at our general TV news site, KSiteTV.