I never thought in my lifetime that RDJ and Nolan would be working together. But, here we are.

I think we can rule out Caine for this one.

https://deadline.com/2021/09/christopher-nolan-universal-pictures-sets-next-film-j-robert-oppenheimer-development-atom-bomb-world-war-two-1234832975/ EXCLUSIVE: Universal Pictures has landed the right to finance and distribute the next film that Christopher Nolan will direct based on his script abo...

https://twitter.com/DEADLINE/status/1437793554353491972 EXCLUSIVE: Universal Pictures has landed the right to finance and distribute the next film that Christopher Nolan will direct based on his script about J. Robert Oppenheimer and his role in the development of the atom bomb. A theoretical physic...

https://twitter.com/DEADLINE/status/1436099600725774336 EXCLUSIVE: Christopher Nolan is readying his next film, and Deadline hears that like Dunkirk it will focus on a seminal moment in World War II. This one is J. Robert Oppenheimer’s role in the development of the atom bomb during WWII. Here is a ...

Final character of SFV: Luke.