On Metebelis Three, Lupton has been killed by the spiders after falling out with the Spider Queen. When the TARDIS lands, the Doctor heads to the cave of the Great One with the crystal. He warns her of the danger of completing the lattice but she does so anyway. However, the forces unleashed are too strong for the Great One and the positive feedback kills her and the other spiders. A vast wave of deadly radiation floods the cave. The Doctor, now very weak, staggers back to the TARDIS and away.