7) Henry Cavill
Yes, this one isn’t very likely, but we’d be remiss if we didn’t include him on this list. Seeing as the actor is the current incumbent of the red cape in the movies, it would make a lot of sense if Henry Cavill reprised the role in Supergirl. There’s even a common fan theory that Supergirl takes place in the DCEU.
It would be incredibly strange, however, if the brooding, sulky Superman Cavill portrays was to turn up in the bright and optimistic world of Supergirl. Plus – spoilers for Batman V Superman ahead – we did just see him die on the big screen. And we really don’t think DC are going to rap that story up on a TV show instead of the Justice League films.
So, despite the fan-pleasing correlation this would make between the TV series and the movies, realistically, the chances of this one happening are fairly slim.