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After his house is destroyed in a fire on his very birthday, Donald Duck finds that he has inherited an "adventure cabana" in the nearby town of New Quackmore. Forced to share it with co-heirs José and Panchito, he discovers secrets about his great-grandfather.

The trio manage to calm the goddess down and she introduces herself as Xandra, the Goddess of Adventure. She initially mistakes Donald, José, and Panchito for The Three Caballeros but is disappointed to find that they are their lackluster descendants. When the trio tell her that they're looking for treasure, Xandra teleports them to Crete where they fight a Minotaur within the hidden labyrinth. Despite their differences, they manage to prove themselves to Xandra as the Caballeros's rightful heirs by finding three magical amulets left by their ancestors. Meanwhile, Baron Von Sheldgoose discovers a magical staff containing his evil ancestor Lord Felldrake.

With Sheldgoose to carry him around and his faithful minion Leopold for transportation, Felldrake begins his evil plans by traveling to Egypt. He intends to use the pyramids, which were actually giant rocketships built by space mummies, to travel to the Moon and take over the Egyptians' giant robot army stationed there. The Caballeros quickly give chase with Xandra's help and foil Felldrake for the first time.

After detecting Felldrake in Rome, Xandra takes the Caballeros to the World Tree, where her fellow gods protect the planets that grow on its branches. Xandra is disappointed to find that the gods have grown older and have given up violence, and she and the Caballeros must encourage them to find the strength to fight again when Felldrake tries to take a planet's power for his own.

On Easter Island, Felldrake and Sheldgoose convince the Moai to take a vacation from their duty of preventing evil Lava Lizards from incinerating the world. Donald refuses to go with the Caballeros as he has a date with Daisy, and so José, Panchito, and Xandra must find a way to stop the Moai beach party without him.

The Caballeros head to Stonehenge, which is the secret portal to Goblin Town. Once inside, the new Goblin King Felldrake sentences them to Goblin Jail and then demands that the goblins go to war. When their weapons prove unsatisfactory, Felldrake unleashes an unstoppable war beast. The Caballeros must recover Xandra's book and escape Goblin Jail before the beast reaches the portal back to Earth.

After retrieving the Spark of Life that Lord Felldrake intended to steal from Mount Rushmore, the Caballeros are assigned to guard it while Xandra and the nieces are at the Institute soirée. When they get bored, they stuff it into the cabana's bear rug, bringing it to life. As the Caballeros try to catch the bear as it seeks food, Xandra crashes the soirée, Sheldgoose deals with the Institute boardmembers who demand explanations for his absences, and Daisy shows off her new boyfriend Dapper Duck to Donald's anger.

To stop Felldrake's new plan, the Caballeros and Xandra travel to the Nazca Lines and enter a world of two dimensions where chalk drawings come to life. However, it ends up being a trap and the Caballeros must escape before Felldrake and Sheldgoose erase them forever. Meanwhile, April, May, and June sneak into Sheldgoose's mansion and make some shocking discoveries.

The Caballeros are heading to Mexico after noticing Felldrake's activity there, but Donald has another date with Daisy and he can't be there in person. The nieces agree to help him by posing as Donald while he speaks to her from Mexico through a pair of magic mirrors, but this backfires and Daisy becomes even more furious. In Mexico, the natives revere and worship Panchito as a mighty warrior before throwing him into a ritualistic wrestling match against Sheldgoose. When the other Caballeros and Felldrake interfere with the match, the God of Death appears and kills them all as punishment for breaking the rules.

The Caballeros are dead and trapped in the Underworld. As they try to escape, they find Clinton Coot, the one who left them the cabana in his will. He explains the history of the original Caballeros and how he spent his whole life following their exploits, then helps them find a way to return to life while newly-appointed Underworld managers Sheldgoose and Felldrake attempt to stop their escape. As the nieces attempt a seance to contact the Caballeros, Xandra goes to the Underworld herself to rescue them. With her help, the Caballeros return to life on Earth, while Felldrake and Sheldgoose are kicked out of the Underworld for being bad employees.

With the Caballeros back among the living, Xandra takes them and the nieces to Camelot to get them some proper "hero training" from King Arthur himself, but the King's purely-motivational training leaves a lot to be desired when the nieces accidentally summon a dragon. Meanwhile, Sheldgoose breaks into the Caballeros' cabana to steal back the Spark of Life. Though he is foiled by Ari and the bear, he manages to steal the amulets instead.

Daisy's patience with Donald has run out, so Xandra books them for a vacation in Shangri-La to help solve all their problems. The Yeti resort staff have orders to not let Donald leave until his temper has been dealt with once and for all, leaving him unable to help the other Caballeros as they begin a final assault on Sheldgoose's mansion to stop him from reviving Felldrake.

The Caballeros battle Monster Felldrake in a final face-off.