In the episode “Orphan 55”, the Thirteenth Doctor (Jodie Whittaker) and her companions Graham O’Brien (Bradley Walsh), Ryan Sinclair (Tosin Cole), and Yasmin Khan (Mandip Gill) are transported to a tranquility spa after Graham wins a free holiday, but the resort turns out to be on a barren earth overrun with mutated beings, implied to be s result of climate change. The Doctor explains this is only one of many timelines and is only a possibility, and says humanity can make a positive change to prevent it.