The actor to actor movie matrix database - Deja Scene
These two again!
Talk about Deja Scene

Search by two actors

Enter two actor/actress names and see a list of movies they have worked in together.

Search by one actor

Enter an actor/actress name and see the entire list of people they have worked in a movie with.

Search by movie

Enter a movie and you can see the cast of actors. Selecting an actor will show you a list of their connections.