Superman to finally be introduced on Supergirl

The way Supergirl addresses the existence of Superman has always been odd. He's a part of the universe, but only ever referred to as "that guy" or "my cousin." Audiences have gotten quick glimpses of the superhero, but there's never been an official first look at the man of steel.

Now, however, Superman is set to make his official first appearance on the show, according to a new report from TV Line. Casting has already begun for the character, although some may be surprised to find out that CBS isn't looking for a handsome, leading man to fill the role, but a 13-year-old boy. Apparently, Superman's first introduction will be through a flashback that establishes his relationship with his cousin.

The casting sheet does call for an actor with "future leading man looks," however, so it looks like Superman's arc on the show won't be a one time event. The young Kal El will reportedly be introduced during the show's 13th episode.

Supergirl airs Monday nights at 8 p.m. ET on CBS.