Grant Gustin of 'Glee' cast as The Flash in 'Arrow'

Grant Gustin has been cast as The Flash in The CW's Arrow. OMG OMG OMG!

Grant played Sebastian Smythe of The Dalton Academy Warblers in Glee.

This is so exciting! There is a possibility that The Flash will become a spin-off show. The Flash is my absolute favorite hero of all time. Barry Allen forever!!!

The Flash is scheduled to appear in three episodes of The CW's Arrow -- eight, nine and 20. Episode 20 will serve as the backdoor pilot for a potential spinoff Flash series.

http://twitter.com/JarettSays/status/378654655359614976

http://twitter.com/THR/status/378654397342834688

https://twitter.com/WallmanPR/status/378654878249127936

Grant Gustin of 'Glee' cast as The Flash in 'Arrow'