Ex-Superman, Dean Cain, and former big-screen Supergirl, Helen Slater, will take on mystery roles in the show.
'Supergirl' stars Melissa Benoist as Kara Zor-El.
Check out the Tweet below for more details.
#Supergirl Casts Veteran Superheroes @RealDeanCain and Helen Slater http://t.co/wZxADJQ5HM pic.twitter.com/zKHFEgQ3s9
— TheWrap (@TheWrap) February 27, 2015
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