Gadrahadradon was supposedly the most haunted planet in its galaxy. The ghosts, in fact, were temporal mists that allowed an individual to see into the future. Astrabel Zar and Charlton Mackerel exploited this when they invented the Tomorrow Window. The Eighth Doctor and his companions chased Martin to the planet when he attempted to kill Astrabel Zar. Martin was killed on the planet and the Doctor passed on the secret of the Tomorrow Window to a young Astrabel Zar through one of the temporal mists. (PROSE: The Tomorrow Windows)

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