The Underwater Menace - Episode One

'What's got into him?' asks Polly. 'I don't know,' says Ben. 'I've never seen him go for food like this before. It's usually hats.'
The Doctor's friends become even more baffled when the Doctor reveals he is eating plankton. 'You'd better get used to it,' he says. 'I don't expect there's much else to be had around here.'

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