Invisible Characters

[Smilla]

Fun thread: My favorites include the unseen background checking/fact finding guy known only as "Danny" from the first couple of seasons of the X-Files, and Michael Weston's hateful father, Frank, on Burn Notice. I think we saw a photo of him once, though, but it was pretty blurry.

[GirlyGhoul]

Howard's mom on Big Bang Theory is mostly invisible, but there was one episode where she was making dessert for Raj and she was shown shuffling past the kitchen door. (Like for a split second) Her face was never shown though.