The uncle of Peter and David invented a time machine, the Time-Conveyor. Daleks stole the Mark One model, hoping to reverse-engineer their own time machine from it. His nephews pursued them through time in the Mark Two. They finally recovered it in Pompeii during the Vesuvius eruption, having defeated the Daleks one-by-one along the way. They returned to their present without their uncle knowing anything had happened. (PROSE: Timechase)

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