Planet (Doctor Who? 135)
From Tardis Wiki, the free Doctor Who reference
In Earth-33⅓, a planet with blue rinse polyester grass and hennaed skies was once visited by the Seventh Doctor and Ace. The Doctor explained to Ace that no matter how bizarre the worlds they visited were there would always be corridors on them. The Doctor openly pondered what episodes two and three would be without these corridors. (COMIC: Doctor Who? 135)
