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The Doctor and Vicki return to the Drahvin ship to find Steven unconscious after Maaga has tried to kill him by leaving him in a depressurised airlock.

They all then return to the Rill vessel, where the Doctor successfully develops a power converter linked to the TARDIS, which charges the Rill craft.

Maaga leads the Drahvins in a final assault on the Rill craft, but the Chumblies defend their ship long enough for it to power up and leave the planet.

One Chumbley left behind to aid the time travellers helps them get back to the TARDIS.

Once the ship leaves, the planet explodes, with the Drahvins perishing on the dying world.