The Seeds of Doom (in-universe)

The Seeds of Doom was a serial of Doctor Who that aired prior to 1981. David reminisced that the story began when deadly seed pods belonging to the Krynoids were discovered at the South Pole. (PROSE: Fanboys)

Important note
This is a in-universe counterpart of the real world Doctor Who television serial The Seeds of Doom that exists within the Doctor's universe. It was mentioned in Fanboys, a short story written by Paul Magrs based heavily upon his childhood with his brother Mark.