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This is the first of several episodes built around Martin's most remarkable invention, a time machine--or more specifically, the Cathode-Ray Centrifugal Time Breakascope (CCTBS for short). Accidentally activating, the machine, Tim (Ray Walston) is hurtled back to the England of the year 1215, just before the signing of the Magna Carta. Equally accidentally, Tim prevents the crucial document from being signed into law by King John (Anthony Eustrel)--and it is up to Martin (Ray Walston) to make certain that world history is not disastrously altered!