sentences:  "The Hidden Planet" by Malcolm Hulke was commissioned in December 1963 and at one point was to be the fourth serial and then later the fifth serial of Series 1 after the insertion of "The Edge of Destruction" into the production block.It would further be deferred in January 1964 when it was realised that substantial rewrites would need to be undertaken.The story would have concerned a planet in an orbit opposite Earth's, with a parallel but in some ways opposite society to ours; for example, women were to be the dominant sex and all clovers would have four leaves.