Casting is currently underway for the character, who will appear in the first two episodes of the series' second season.

Superman's appearance on show will mark the character's first new live-action appearance on TV since "Smallville" ended in 2011.

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Reacting to Superman's debut, executive producers  Greg Berlanti and Ali Adler said 'we are beyond thrilled to welcome Clark Kent and his slightly-more-famous alter ego to the world of Supergirl. Superman will be appearing in the first two episodes of the new season and we cannot wait to see who next dons the red cape!”

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"Supergirl" stars Melissa Benoist as Kara Zor-El, who escapes the destruction on Krypton to join her cousin on Earth, while "The Flash" tells the story of Barry Allen, whose life changed completely when his mother died in a freak accident and his innocent father was convicted of her murder.

The show also stars Mehcad Brooks, Calista Flockhart, Chyler Leigh, David Harewood, Faran Tahir, Dean Cain and Helen Slater.