The Day of the Comet (audio story)

 was the second story in the tenth series of the Fourth Doctor Adventures, produced by Big Finish Productions. It was written by Jonathan Morris and featured Tom Baker as the Fourth Doctor and Louise Jameson as Leela.

Publisher's summary
The TARDIS brings the Doctor and Leela to the ruins of a once-great city racked by earthquakes, where they find a giant rocket on the side of a mountain. The planet is due to be destroyed by a comet in a year’s time and this ship is the only way off world.

But is everything quite as it seems? At least one person in the city thinks the comet is going to come to obliterate the planet much sooner than people believe.

Which would be bad enough - if there wasn’t a far worse secret hidden behind the scenes...

Part one
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Part two
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Part three
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Part four
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Cast

 * The Doctor - Tom Baker
 * Leela - Louise Jameson
 * Sullerman / Massey - Jon Culshaw
 * Corsha - Sophia Carr-Gomm
 * Verkuvia - Janet Henfrey
 * Tynax - Joanna Hole
 * Lendrik - David Seddon
 * Vengis - Mandi Symonds

Continuity

 * to be added