The Silurians Morka and Kchtaal kill primitive humans for fun. Their tribe's leader, Morka's father, tells Morka he must go hunting for primitive humans to take into the shelters to make up for the ones that were killed.
Morka and Kchtaal encounter a tribe which attacks them with rocks and sticks, killing Kchtaal and injuring Morka. He brings Kchtaal's body back to the city. They must evacuate the city because of an earthquake, and Morka must decide whether to bury Kchtaal there, leaving him behind, or carry him to the northern city.
- Morka rides a dilophosaurus, while Kchtaal rides a plateosaurus.
- A volcanic eruption causes an earthquake which endangers the Silurian city and buries the entrance to the shelter.
- Okdel is the leader of the northern city.
- Morka thinks K'to is stupid.
to be added
- The entire text of the piece at the Doctor Who Reference Guide