Moby Dick

Moby Dick was a massive white whale from the novel Moby-Dick. The Twelfth Doctor found this book boring, and bemoaned, "Honestly, shut up and get the whale." (TV: Extremis)

The whale existed in the Land of Fiction, as well. When the Cybermen invaded the land, they cyber-converted the whale, and fitted it with torpedo tubes. (AUDIO: Legend of the Cybermen)