Planet (Praxeus)

A planet was attacked by Praxeus, and its inhabitants succumbed to the pathogen, prompting them to send out teams to find a cure. One team, Suki Cheng and her crew, landed on Earth and eventually found a cure and informed their home about it, but ultimately succumbed as well. However, the Thirteenth Doctor warned that the cure likely wouldn't work on Suki's people since it was designed for humans and it may have disasterous effects on other species. (TV: Praxeus)