During the events of the Second Doctor's trial in the climax of season six's ten-part long "The War Games", the Doctor refers to the Yeti as one of many threats that he has defeated during his travels. When in the 1983 serial "Mawdryn Undead" the Fifth Doctor encounters a retired and amnesiac Lethbridge-Stewart the Yeti are one of many references the Doctor makes to trigger the Brigadier's memory. Clips from "The Web of Fear" are also shown in a flashback montage during this serial. A Yeti is also one of the creatures featured in "The Five Doctors" and is encountered by the second Doctor and the Brigadier (Nicholas Courtney) as they cross through the Death Zone. The Brigadier later references the Yeti in the 1989 serial "Battlefield" as one of many alien adversaries that UNIT is prepared for. The Doctor's encounters with the Yeti are also referred to in the 2012 TV story "The Snowmen" when the Doctor uses a map of the 1960s London Underground to prove a point in front of a younger Great Intelligence, referencing its later invasion in 1968's "The Web of Fear". The story also serves as a prequel to "The Abominable Snowmen".