The Ghost Monument
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 . 
<triplet> Thirteenth Doctor <subj> Jodie Whittaker <obj> performer <triplet> Graham O'Brien <subj> Bradley Walsh <obj> performer