Kleptomaniacs, coprophages and a scientist fanboy battle a civilisation-devouring sharknado from outer space

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We open on Lady Christina de Souza stealing from Mission Impossible, Indiana Jones and The International Gallery, all at once. Escaping the scene of the crime, she boards a number 200 bus and is promptly joined by our Converse-clad hero, The Doctor.

Shazam! Wormhole alert. The bus takes an unexpected detour beyond the Scorpion Nebula to the planet of San Helios, where the unfortunate passengers encounter two shit-eating bug dudes appropriately called Tritovores and a swarm of civilisation-devouring stingrays.

It now falls upon the Doctor, in reluctant collaboration with Lady de Souza, to get The Mighty 200 and its patrons back to London, without letting the stingrays through as well, and before U.N.I.T. closes the wormhole back on Earth.

(Correction: In this episode, Ponken compares the Tritovores to the nightmarish vision of insect creatures that Pertwee has in The Mind of Evil, but upon closer inspection they look quite different. In fact, it's possible that Pertwee has visions of Zarbi!)

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