The Great Sky Whale was a League slave-ship, captained by the High Leaguesmaster Marl Mankroyd. A colossal ship with four masts and four flight-rocks, the Great Sky Whale was almost as large as The Bringer of Doom, though much more cumbersome. Wind Jackal's sky ship, the Galerider, was attacked by this ship, but he managed to defeat Marl Mankroyd, and sent the Great Sky Whale hurtling off into Open Sky.