1) Tom Welling
This is the rumour that the internet has gone wild over since Superman’s arrival in Supergirl was announced. As the star of Smallville, which ran for a colossal ten seasons, Tom Welling holds the record for playing Clark Kent the most. However, it is ironic, then, that he has never really played Superman. The prequel series finally showed him going into action as Supes in the final moments of the finale, but didn’t give us a proper look.
It’s previously been said that Supergirl’s tone most closely resembles that of Smallville, so it would make a lot of sense to finally let the actor don the costume in a guest appearance on that show. Welling has not sounded keen on returning to the role in the past, but hopefully he can be persuaded otherwise.
[zergpaid]If it did happen, fans would obviously be hung up on the fact that Smallville’s Superman and Supergirl’s can’t be the same as the details differ. This can be explained away in the same vein as Routh’s appearance could though – it happened on a parallel world.
Come on CW, there is literally no downside to this happening.