OT: Improve a Movie by changing a cast member

Take a movie and replace an actor or actress with another to make it better. Try to keep it somewhat age and era appropriate - no putting Clark Gable in The Avengers or Dakota Fanning in Star Wars.

I’ll start. Gangs of New York - replace the incredibly miscast Cameron Diaz with Keira Knightly. Or Amy Adams. Or my left nut. Diaz sucked in that otherwise decent film.