The junkyard was one of the forms assumed by the complex space-time event I.M. Foreman's One-Species Nongenetically Engineered Travelling Show, which travelled the universe and assumed new appearances on each planet, "shedding" these forms as it moved on. The show spent a few months on Earth in early 1963 before it moved on, the junkyard and its passing creating a "dent" in space-time that attracted the First Doctor to the junkyard. (PROSE: Interference - Book Two)