V.V. Argost, host of the popular TV show, Weird World, is after the legendary Kur Stone, which is capable of unleashing the powerful ancient Sumerian cryptid, Kur. With it, V.V. Argost plans to rule the world, so it's up Doc, Drew and Zak Saturday to stop him.

With two of three Kur Stone pieces now in V.V. Argost's possession, the Saturday family races to the location of the final stone piece, Manaus, Brazil before Argost can get to it.

The Saturdays discover a "Bigfoot" like creature in Japan who wants revenge on his creator.

After disturbing an Inuit chamber, the Secret Scientists accidentally create a giant snowstorm. Along with this snowstorm comes a creature known as an Amarok.

When Zak finds out that a cryptid hunter plans on attacking their headquarters, he comes up with a plan to save the day without ruining Doc and Drew's anniversary.

V.V. Argost becomes the new king of an ancient, sunken city that has been resurfaced.

When Drew spots Van Rook's new apprentice Doyle without his mask on, she wonders if he is really her long-lost brother.

When a volcano erupts, a lizard-man known as the Cherufe is released.

When the Saturdays travel to Southern England for information on the Kur Stone, they end up getting involved with a string of disappearances caused by the Owlman.

After the Saturdays rescue Agents Epsilon and Francis, space jellyfish attack.

When water supplies in the Middle East are inexplicably turning into salt, the Secret Scientists send Drew and Zak to investigate.

When Zak touches the mystic Smoke Mirror of Tezcatlipoca, it unleashes the Monday family, evil doppelgangers of his family with their own unique powers

The Saturdays discover the existence of underground cryptid fights run by Leonidas Van Rook. They soon discover that Van Rook isn't in on this on his own.

As part of Zak's training in his cryptid-influencing power, the Saturdays travel to New Guinea with Ulraj (the young king of Kumari Kandam) to investigate a dinosaur/bat creature called the Duah.

When Doc receives a troubling "visit" from what appears to be the ghost of his old mentor, the Saturdays travel to Louisiana's Honey Island Swamp to let Doc finish the work he and his mentor started over 25 years ago.

The Saturdays stumble across a hidden city built in the middle of an African lake, but this paradise in being threatened by repeated attacks from the giant, catfish-like Lau.

Argost recruits Van Rook and Piecemeal to kidnap Fiskerton, whom Argost suspects may be Kur.

To rescue their kidnapped family member, the Saturdays and Doyle are forced to assault Weirdworld itself.

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