The one where a giant egg weaves a metal shell around a neutron star...
It's all coming out now! Now that the Tythonian beast has got his little appendages on the weird shield thing, he's able to take control of the larynx of whoever holds it and communicate with everybody. The big green blob is actually named Erato, High Ambassador from the planet Tythonus, who came to Chloris 15 years ago to strike a trade deal. But instead of been welcomed with open arms by the people of Chloris, Erato was unlucky enough to bump into the self-serving Adrasta first, who tricked him into falling into the pit and skulking around in her spent metal mine.
It's all about economics and greed, you see. The Tythonians live on chlorophyll and mineral ores, but that's all running out on their planet, so when they heard there was a world virtually made of chlorophyll (the clue was in the name) they thought it would be a good idea to trade Tythonian metal for Chlorisian vegetable matter, so that the big blobs could eat well and the people of Chloris could use the metal to fight back the suffocating plant-life. But Adrasta, being owner of the only metal mine and most of the metal on Chloris, saw the trade mission as a threat to her wealth and supremacy, so chucked Erato into the pit and fed astrologers at him (great line from the Doctor, that!).
It's all coming out now! Now that the Tythonian beast has got his little appendages on the weird shield thing, he's able to take control of the larynx of whoever holds it and communicate with everybody. The big green blob is actually named Erato, High Ambassador from the planet Tythonus, who came to Chloris 15 years ago to strike a trade deal. But instead of been welcomed with open arms by the people of Chloris, Erato was unlucky enough to bump into the self-serving Adrasta first, who tricked him into falling into the pit and skulking around in her spent metal mine.
It's all about economics and greed, you see. The Tythonians live on chlorophyll and mineral ores, but that's all running out on their planet, so when they heard there was a world virtually made of chlorophyll (the clue was in the name) they thought it would be a good idea to trade Tythonian metal for Chlorisian vegetable matter, so that the big blobs could eat well and the people of Chloris could use the metal to fight back the suffocating plant-life. But Adrasta, being owner of the only metal mine and most of the metal on Chloris, saw the trade mission as a threat to her wealth and supremacy, so chucked Erato into the pit and fed astrologers at him (great line from the Doctor, that!).