When a drill drills too deep into the earth, something that had been hibernating beneath the earth's crust is woken, and it's hungry for revenge.
Episode rating
Cast of episode
43
38
15
1
- Amy Pond
- The Doctor
- Rory
- Madame Vastra
- Nasreen Chaudhry
- Tony Mack
- Ambrose
- Mo
- Elliot
- Silurian
- Silurian Warrior
- Malohkeh