Visitor (Chute! Episode 9)

At some point in the 2000s, a girl fell down a chute into the BBC Television Centre rubbish tip where Ross Lee had already been trapped for weeks.

She encountered Clyde Langer and Luke Smith after they also fell down the chute, and she was seemingly eaten by the mysterious monster that lived in the tip.

As Ross pointed out, she didn't talk much (well, not at all, for that matter). (TV: Chute! Episode 9)