|Age||Likely about 4-7 years old|
|First Appearance||The Kur Guardian|
In several flashbacks, is when young Zak is shown. His white tuft of hair is rounded and he wears orange pajamas, and sometimes a Mokele Mbembe T-shirt. Young Zak has a higher pitch (in voice) and tends to be very playful. He didn't know anything about his cryptid power yet since he only discovered it in the comic "The Cannibal Curse".
In The Return of Tsul 'Kalu, it is revealed that young Zak was the one who destroyed the Judaculla stone in an accidental rockslide, causing Tsul 'Kalu to go after him. Tsul 'Kalu tracked the Saturdays, until one night he spots Doc in the HQ while he was trying to attack a soundly sleeping Zak. Doc told him that Zak was too young to take responsibility for his action, and as his father, Doc would take it for him. After that, they went to the roof of the Saturdays HQ and had a fight. In the end Doc won and received the Hand of Tsul 'Kalu as a prize but he lost the sight of one eye in the process. So in order to keep Zak from feeling guilty, Drew and Doc told him that it happened from an experiment accident. Zak looks to be about 4-7 years old in these pictures.