A group of young Olympians prepare to rule the universe and defeat the Titans.

"Get to know Persephone, the Queen of the Underworld, in this twenty-sixth Goddess Girls adventure!--

When things start to go wrong after Nyx, goddess of the night, enrolls at Mount Olympus Academy, she has to determine who is responsible for a series of disasters while trying to change the other students' minds about nighttime.

Hades must conquer his fear of dogs and tame, Cerberus, a three-headed dog, so Titan prisoner, Oceanus, can be put back where he belongs.

After a sea battle between the Olympians and the Titans, the Olympians find themselves shipwrecked on an island, and when Uranus' stars falls into the ocean, a dangerous wave of bubbles heads towards the island.

During a secret trip to the Immortal Marketplace, Clotho, one of the three Fates, risks revealing her identity and if that were not enough, she must face up to an old mistake she made several years ago that could mess up a mortal's whole life.

A giant spiderweb appears in the sky with a message for Zeus and the other Olympians. Trying to dodge the sticky web causes the Olympians to get separated again. Zeus, Poseidon, Hera, and Athena seek Athena's magical object, Threads of Cleverness. They also face Cronus and manage to escape until the time is right to battle and defeat him.

Artemis, a great athlete, enlists her fellow goddesses Athena, Persphone, and Aphrodite in a plan to persuade Zeus to open up the boys-only Olympic Games to girls.

Persephone and her friends must rescue Athena from the evil King Hephaestus, who has turned Athena into a statue and hidden her in his massive treasure room.

Elpis, a hope-spreading bubble, is given the chance to become the Spirit of Hope at Mount Olympus Academy if she can prove herself as a human girl among the students, but quickly realizes that being a human girl comes with some challenges.