Nathaniel Scrope

 was saved by The Doctor and Jamie McCrimmon from being attacked and soon befriended them. The Doctor ends up telling John Thurloe about Scrope and it is revealed that he is an undercover agent. At the time, Scrope saves Ben from the marshes and they end up seeing Prince Rupert who Scrope discovers is Prince Rupert. Scrope ends up telling Thurloe of this. Thurloe lets Polly and the Doctor go to World Turn'd Upside Down to look for traces of conspirators. They end up meeting Christopher Whyte there who tells them that Oliver Cromwell is to be assassinated while addressing the Rump Parliament.