The actor who plays ‘The Stupendous Yappi’, Jaap Broeker, is actually David Duchovny’s stand-in, filling in for D.D. when scenes are blocked or lighting is measured. Writer Darin Morgan saw Broeker on the set waggling his eyebrows and wrote a scene for him.

The actor who plays ‘The Stupendous Yappi’, Jaap Broeker, is actually David Duchovny’s stand-in, filling in for D.D. when scenes are blocked or lighting is measured. Writer Darin Morgan saw Broeker on the set waggling his eyebrows and wrote a scene for him.