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

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

When Zak and Doyle go on a training mission in an abandoned town, they make a surprising discovery.

The Saturday family call on the para-neurologist Dr. David Bara to find the motivation behind Fiskerton's strange instinctual behavior, while V.V. Argost sends a Neural Parasite to the Saturdays' home to extract Kur's location from the creature's brain by force.

Upon arriving in Antarctica, V.V. Argost releases Kur from beneath the ice. The Saturdays battle against Kur, giving Argost the opportunity to sneak inside its body and control it from within. Zak follows Argost inside, pitting his powers against Kur's might. After a long struggle, Zak manages to overcome Kur, knocking it unconscious. The cryptids formerly under Argost's control turn on him, forcing Munya to carry him out to safety. Outside of Kur, Doyle uses the Kur-sensing relic to solidify the point that they are near Kur. However, once Zak is expelled from Kur's body,the glow began to fade. Doyle approaches Zak, and the artifact glows strongly once more—showing that the Antarctic Cryptid wasn't Kur, but that Zak is actually Kur.