Steven and the Gems set sail on the gem sloop to find and retrieve
a gem artifact in a remote location inaccessible by warp pad. They discover
that the artifact is guarded by a territorial gem monster, who shipwrecks
the Crystal Gems in their first attempt to get the artifact. Luckily, Onion
and his dad Yellowtail are out on a fishing trip and happen upon the Gems
at just the right time.