A few days ago, The Vampire Diaries alum Chris Wood was cast in Supergirl as a mystery character from the comic books. There's since been a lot of speculation about who he might be playing (and we may very well get an answer at this evening's Comic-Con panel for the show), but Bleeding Cool claims to have learned his identity. Apparently, it was Mon-El who was in the pod that crash landed to Earth.
A member of the Legion of Superheroes, Mon was initially mistaken for a Kryptonian by Superboy in the source material before it was revealed that he was actually a member of the Daxamite race. He's also served as part of both the Green Lantern Corps and Justice League, and while his history with Supergirl is a little on the thin side, there's obviously a lot which can be done with a character like this.
We'll have to wait and see whether or not this is made official, but there's no denying that Mon-El is going to be a pretty interesting addition to Supergirl during the show's upcoming second season.