The Making of The Trial of a Time Lord: Part One - Mysterious Planet was the first of four documentaries in the Making of The Trial of a Time Lord series. As the name suggested, it concerned itself with the making of The Mysterious Planet. It was by far the longest of the four parts. It was the only one of the four documentaries which did not bear the full name of the serial under discussion, and the only one not co-executive produced by Ed Stradling.