1.   The director cast an unknown in the lead role.

2.   Believing they were better off casting an unknown, Universal initially auditioned hundreds of young actors.

3.   For the part of Ian, Hanks was intent on casting another unknown so that the movie would introduce two new actors to the world.

4.   Relative unknowns have been cast for the key parts in the film.

5.   The unknown is cast.

6.   Why cast unknowns such as Jackson and Fleming when you can cast leading men like Daryl Johnston and Jay Novacek?