Anchors Away is a quest that Donald Duck will give to Mickey in Epic Mickey: Power of Illusion.
Donald will ask Mickey to find him an Anchor. After joking about using Goofy for the job, Mickey announces that he knows where to find a real anchor.
The Anchor can be found in Under the Sea. Once found, Goofy will hand Donald the Anchor, and, in return, Donald will reward Mickey with a Thinner Upgrade and a Room Star.