The Doctor and Antimony arrive at an analysis centre for radio telescopes. They meet Dr Kane who tells them Dr Valentine and Antinor were killed by animals — perhaps a dog or a large cat — they were bitten. The Doctor asks her what they were investigating before they died. The Doctor discovers that black holes are being created and that existing ones are growing at a drastic rate. Something has torn a rent in space-time. Two policemen, Campion and Speedwell, arrive at the centre investigating the Doctor's activities at the crime scene, but Speedwell is called away to another animal attack in the East End of London, accompanied by the Doctor.