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

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.

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

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When the Saturdays invade Weirdworld to rescue Fiskerton, Doyle shows up to lend a hand. Argost reveals Fiskerton's Lemurian heritage to Fisk and Doyle, but the family doesn't yet know.

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

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A series of attacks on the Secret Scientists prompt Zak and the family must go on a quest to clear Fiskerton's name.

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.

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

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

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The Saturday family and King Ulraj travel to New Guinea to investigate the Dua'a, a prehistoric flying cryptid.

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

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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.

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.

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