Ransom explains that he is going on a mission to defend the planet Perelandra. He enlists Lewis to ensure his safe departure.

Ransom wakes on his island to see a human form - a woman - facing him from a neighbouring island.

Ransom sees Dr Weston approach from the crashed spaceship, and races to meet him before he can talk to the Green Lady.

During their conversation, Weston suffers from a kind of fit, but in the morning Ransom finds his body has disappeared.

Ransom realises the responsibility of saving the new world rests with him.

Ransom and the Un-Man continue their battle.

Ransom finds himself in an underground world, from which he starts to clamber out...until he hears something following him.

Ransom and the Un-Man have their final confrontation.

Ransom climbs up a mountain pass where he finds the eldila of Mars and Venus waiting for him.

The King and Queen of Perelandra appear to praise Ransom for defending their planet from evil.

On his way to Dr Ransom's, Lewis is beset by a sense of panic that is not dispelled by the sight greeting him on arrival.

Ransom voyages to Perelandra, and lands in what appears to be a giant ocean dotted with floating islands where he takes shelter.

Ransom swims to the other shore and discovers that the Green Lady is none other than Perelandra herself.

The Green Lady tells Ransom of Maleldil's decree; she cannot stay the night on the mountainous island known as the fixed land.

Ransom finds Dr Weston mutilating the island's creatures, and realises that he is a bridge for the 'Bent One' to enter Perelandra.

After Weston's taunts, Ransom guards Perelandra day and night.

While the island lies under a charmed sleep, Ransom finds the Un-Man and attacks him.

Ransom says farewell to Perelandra and returns to Earth. Episode 18 of 18.