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10/10 The crew of spaceship Challenger's search is over, but Earth is not how they left it.
BBC Radio 4 Extra
9/10 The starship Challenger's crew finally locate their planet, but what will they find?
8/10 An android built by the computers on spaceship Challenger suffers severe logic failure.
7/10 Dragged into an artificial black hole, the Challenger crew face Spaceguard Six.
6/10 With the Angel computers weakened, the starship is plunging into a black hole.