 In the episode, the Thirteenth Doctor (Jodie Whittaker), an alien time traveller, accidentally transports her human friends Graham O'Brien (Bradley Walsh), Ryan Sinclair (Tosin Cole), and Yasmin Khan (Mandip Gill) to a distant solar system, whereupon they become part of an interplanetary alien rally that crash lands at their final stop on the hostile planet of Desolation.Becoming involved in the race themselves, the Doctor and her friends find themselves seeking out the finish line, revealed to be the TARDIS, in order to get back to Earth.