Outro: What are you going to do when the Earth is overpopulated by over a hundred billion people? The question of rhetorical for it will not happen in your time. But in 2471 the answer will need to be found. One band of desperate terrestrials will blast off to colonize a barren planet. How they fare will be documented next Sunday night at 11 as we accompany The Doctor and Jo to the "Colony in Space." [source: ChicagoEpguides]