I don't know if this is OT, but I've been wanting to say something about name actors.
William Goldman said that, in any scene, a named actor must not lose to anyone, UNLESS there is another scene where it's made clear that he lost on purpose. IOW, if Johnny Movie Star lost a fight, he will have a scene where he tells someone else, "You know I could have won, don't you?" - and that someone else says, "Of course you could have - you just lost so the other guy would feel good."
Applying this to my beloved Empire Strikes Back, if Luke Skywalker had been played by that Johnny Movie Star, he would never have lost to Darth Vader - or, if he had, Obi-Wan would have shimmered into existence, and Luke would have said he could have beaten Vader but didn't because Vader was his father. That would have ruined THE ENTIRE MOVIE.
If Goldman is anywhere near correct, I will NOT have any named actors, because they will not lose to anyone else. To me, the SF movie is the star, NOT the actors.