Anonymity can be a useful tool for many - superheroes, whistleblowers, Twilight fans - and yet for actors, keeping your identity a secret would seem to be self defeating.
So, who exactly would prefer to remain unknown and why? Star power can lend a real weight to a production but it can also be a major source of plot spoilers. If a performer appears in all the publicity and not on the screen for the first two acts, it isn't a stretch to predict who's going to shoot up in act three.
However, remaining incognito can also be indicative of a lack of confidence in the project - James Earl Jones took no credit for the first Star Wars film but by the time Empire hit the screens, his name was very much attached.
Conversely, many thespians take gigs as favours to industry friends (so read on to find out how Gene Hackman found his comedy feet whilst playing tennis with another famous Gene.)
With a list containing some of Hollywood's most well known actors, extreme profanity from Tom Cruise, even worse profanity from Linda Blair and some good sports who were willing to forgo their vanity for the love of suspense, here are ten of the best anonymous roles in film.