Onyx joins a group of fellow occultists to attend a dark ritual at the mansion of their idol, Bartok. Suspecting Bartok’s nefarious intentions, Onyx is suddenly immersed in a world of monsters, mystery, and mayhem.

When a reformed raincloud teams up with a shipwrecked sea-postman and a magic walrus, the three form the Middlemost Post — the wackiest and most loveable postal service on Mt. Middlemost.

Shrek, Fiona, Donkey, Puss in Boots, and the rest of the Far Far Away Kingdom battle it out in a singing competition.