SDCC2018: Sam Witwer Joins Cast of ‘Supergirl’ as Agent Liberty

© 2018 Warner Bros. Entertainment Inc.

Fresh from Comic-Con 2018, this Supergirl trailer gives fans a look back at some exciting highlights from season three, plus a taste of what’s coming in the show’s fourth season, including a sneak peek of new series regular Sam Witwer as iconic DC character Agent Liberty — and an unexpected reveal for Supergirl herself!

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