Krakken is a sea monster which appears in the direct-to-video sequel Atlantis: Milo's Return.
Atlantis: Milo's ReturnEdit
The Krakken is first seen attacking a Norwegian cargo ship located somewhere in the North Atlantic. A few days later, upon Kida's first trip to the surface and Milo's return to the surface along with Vinnie, Mole, and Audrey, the Krakken attacks their ship but is eventually foiled by Milo and his friends in their sub pods, destroying the beast with numerous missiles fired from their pods. According to Inger Allyson, the innkeeper of a nearby fishing village, their magistrate Edgar Vulgud made a deal with the beast to live forever but forgot to ask for eternal youth. The sun in their village hasn't shone since the beast went loose in the sea.
At one point, The Kraken sea monster makes a sound similar to a brachiosaurus.