As Jo explores, the TARDIS is rapidly covered by plant sap, which is hardening into a shell around it. When the Doctor awakens, he finds himself sealed in and the oxygen in the TARDIS rapidly being used up. Activating the emergency oxygen supply, he discovers the tanks almost empty, and starts to suffocate from lack of air. Jo discovers a spacecraft in the jungle with a dead pilot. Shortly after, three blonde haired humanoids enter the spacecraft, identifying themselves as Taron, Vaber and Codal. They offer help but are cautious as there is an apparent danger outside.