Free to travel in time and space once more, the Doctor joins forces with journalist Sarah Jane Smith to investigate new mysteries. Their trips involve a meeting with the clone warriors of the Sontarans, a renewed threat from the Daleks, a return visit to Peladon and an unexpected infestation of dinosaurs in Central London. But a previous decision is coming back to haunt the Doctor, and will lead him to a fateful meeting with destiny on Metebelis III.
