After the death of co-creator Mervyn Haisman, the Guardian's obituary called the Yeti his 'lasting legacy' to the series, noting how the monsters quickly found popularity among viewers. Their second appearance in "The Web of Fear" was considered such a success by the production team that the sixth season Cybermen serial "The Invasion" was intended as both a follow-up to the second Yeti adventure and a pilot for a new earthbound format for the series. The Third Doctor Jon Pertwee is known for commenting that nothing frightened an audience more than "a Yeti on your loo in Tooting Bec" in reference to the success of the earthbound format, associating the creatures strongly with the new direction of the series.