9 August 2017
First on this list of movies with the smallest cast is 10 Cloverfield Lane. The movie has an onscreen cast of three, but with some background voices. That’s still pretty small, so it counts.
Second is Gravity as it managed to cut down the size of their onscreen cast to just two and a background voice, after killing off several characters early on.
Buried with Ryan Reynolds took it a step further and cut the cast to one. However, there are multiple actors that can be heard but not seen.
All Is Lost thought even background voices are too much, so they cut that out and just used Robert Redford. There’s literally no other cast member listed in the credits.