When the Doctor, Bill, and Nardole stumbled across a lost and powerless cargo ship in the middle of space, they realized that the situation on board was worse than they ever could have imagined! Transporting over five-hundred Heavenly Hosts, the crew were disappearing, and the ship's systems were failing... Could the Hosts have malfunctioned once more... or is there something even more sinister lurking on the ship?

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