Doctor Who Magazine Issue 578 (in-universe)

An issue of Doctor Who Magazine featured a dark-skinned man with white hair on its cover. (COMIC: The Daft Dimension 579)

Behind the scenes
The issue's identity can be drawn from a process of elimination based on DWM issues released up to that point; DWM 578 was the first and only issue of the time to feature Ncuti Gatwa on its cover.