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I would say there's actually precedence for not crediting an actor if it would ruin the story; in the stage production of The Woman in Black, the actress who plays the ghost goes uncredited. (I don...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/38955 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would say there's actually precedence for _not_ crediting an actor if it would ruin the story; in the stage production of _The Woman in Black_, the actress who plays the ghost goes uncredited. (I don't have a copy of the program but [the website](https://www.thewomaninblack.com/cast) only credits the two actors and their understudies.) She doesn't even take a bow at the end of the show; I assume this is to keep the audience immersed and to make her that much more otherworldly and memorable. But if you want to give the actor full credit in the program, I'd say the best way is to list them as 'ensemble' - it's non-specific and implies a bit part or many bit parts. As long as you're not casting a huge, well-known actor in the role, it shouldn't give anything away.