Fantasy
An enthusiastic filmmaker thinks he's come up with a totally original idea: animation set to classical music! When he is informed that some American named "Prisney" (or something) has already done it, he decides to do his own version, using an orchestra comprising mostly old ladies and an animator he's kept locked in a dungeon.
A Victorian era scientist and his assistant take a test run in their Iron Mole drilling machine and end up in a strange underground labyrinth ruled by a species of giant telepathic bird and full of prehistoric monsters and cavemen.