Leviathan (Earth spacecraft)

Leviathans were immense generation starships designed by humanity in the mid-22nd century. They became obsolete after faster-than-light travel was discovered.

The Sentinels of the New Dawn placed themselves in suspended animation on one Leviathan which they populated with clones and set on a course towards the planet Phlegethon. Centuries later, the ship was visited by the Sixth Doctor and Peri Brown. (AUDIO: Leviathan)