Flash leading man Grant Gustin and Supergirl star Melissa Benoist have two things in common. First, they both play the sunshiniest DC superheroes ever to brighten our TV screens in their respective shows. Second, they both got their big breaks on the Fox high school musical series Glee, playing sinister prep school bully Sebastian Smythe from season three and shy ingenue Marley Rose from season four, respectively.

Maybe there's something about the big broad performances in Glee that perfectly prepares an actor for a superhero role. It's certainly true that Gustin and Benoist both posssess an effortless enthusiasm and charm that makes them believable heroes. Though the actors never got to duet on Glee, they will cross paths in their costumed alter egos in Monday March 28's Supergirl episode "Worlds Finest", a cross-network event that should provide one of the most joyful hours of superhero action in 2016.

To mark the occasion, ComicsAlliance's Elle Collins and Andrew Wheeler took a look at other Glee cast members who could follow their former colleagues into heroic roles on the DC super-shows --- perhaps in guest spots on either The Flash or Supergirl.