TV Comic Land

TV Comic Land was a place the Fifth Doctor described as more ghastly than Skaro, twice as horrendous as Vortis and ten times more terrible than E-Space. He regarded the location in this way because John and Gillian resided there. He and Nyssa once materialised there where upon they encountered his "so-called" grandchildren. (NOTVALID: Doctor Who? 72)

Behind the scenes
TV Comic Land offers a humourous explanation for John and Gillian's place in mainstream continuity. 1994's Conundrum later posited more seriously that they were products of the Land of Fiction while 2003's The Land of Happy Endings suggests they were part of the Doctor's dreams.