The Doctor tries to get everyone to Rio, but nothing quite goes as planned. They arrive in a small Welsh village where the Doctor immediately senses that the ground isn't quite right. There is a drilling rig nearby that has reached a depth of 21 kilometers when odd things begin to happen. A local village man has disappeared and soon after Amy is swallowed into the ground. The Doctor realizes that the drilling has disturbed an ancient reptilian race that has lived deep underground for thousands upon thousands of years and who are determined to protect themselves against the 'apes' who live on the surface. Written by
Did You Know?
One major story element that was ultimately excised from the script was a new monster called the Armasaurs, armadillo-like dinosaurs which would emerge from the Silurians' shafts to abduct people. Due to budget constraints, it was replaced with the bioprogrammed quicksand. See more
Oh look, a big mining thing. Oh, I love a big mining thing. See, way better than Rio. Rio doesn't have a big mining thing.
We're not going to have a look, are we?
Let's go and have a look.
Doctor Who Theme
Written by Ron Grainer
Arranged by Murray Gold
Performed by BBC National Orchestra of Wales See more