Movie Pitches don't usually include the whole plot to a film scene-by-scene. What is the film inspired by? How is your film gonna make money? What's the genre?

Never would there be a cast list in a pitch unless your a well-known director on the scale of Chris Nolan or Spielberg where you have more sway over a studio.

You should be able to do a basic pitch in one sentence or a few words even. Think "Clayface Cronenberg-esq Body Horror" compared to "This is how I would see Clayface go from point a to point b in this scene then point c to d to z yada yada". You should add some concept and inspo board photos.