WTTW broadcast the story into two parts, with the split taking place during episode three when Caldwell tells the Doctor that an attack on the IMC ship would be a slaughter. [source: ChicagoEpguides]

Outro: Jo's captivity by the primitives will be longer than she anticipated: at least another week. When that period elapses, we will learn her fate, and The Doctor's and we will confront the doomsday machine. And that's not all. But, it's all I'll say for now. We do want you back, at 11:00 next Sunday night for part two of "Colony in Space." [source: ChicagoEpguides]