List of characters in The Secret Saturdays

This is a list of characters in the Cartoon Network animated television series The Secret Saturdays.

Zak Saturday is the 11-year-old (he turns 12 in "Kur Parts 1&2, turns 13 in "Life in the Underground") major character of the show. The son of Doc and Drew Saturday, Zak seeks adventure at every turn, which is easily satisfied by his cryptid-researching family. Zak has an unorthodox upbringing that has taken him around the planet and placed him in the face of danger since the day he was born. Zak was born the same year the Kur Stone was found (specifically, he was conceived shortly before the discovery). Zak has a special psychic ability to connect with cryptids, allowing him to control their actions to an extent. Tamer cryptids seem to trust him instinctively and even fiercer ones can tell that Zak is different from other humans.

Zak's primary weapon is the Claw, a combination staff/grappling hook. The hook is a three-fingered claw called the Hand of Tsul 'Kalu, which acts as a focusing device for Zak's powers. Zak also seems stronger and more durable than a normal child his age, as he was able to climb a radio tower carrying a full grown man in "The Vengeance of Hibagon" and gets back up immediately after being thrown against a vent in "Black Monday".

For a while, it was believed that if the cryptid Kur was ever unleashed, Zak would be the only one with the power to stop it. However, in the season one finale "Kur Rising", after Zak defeated the creature that was believed to be Kur, the Kur-sensing Naga relic Doyle had repaired glowed not in the creature's presence, but in Zak's, meaning Kur was in fact Zak the entire time. Jay Stephens has confirmed that Zak is actually Kur reincarnated. It was eventually learned that the Kur Stone Doc and Drew discovered before Zak's birth contained Kur's essence. During the accident when it was uncovered, the energy was released from the stone and found a new host, namely, the unborn Zak. This was because, as Rani Nagi said, it was a much more dangerous form as it could exist between the worlds of humans and cryptids. This meant that Zak is half-cryptid. Despite the Saturdays trying to keep the truth about Zak's nature secret, the other Secret Scientists found out through unexplained means and began pursuing Zak, forcing the Saturdays to go on the run. The Nagas have also sought him, intending to have him embrace his inner nature and become their new master. Following Rani Nagi's attack on Manhattan, Zak and Fiskerton are approached by V.V. Argost, who offers Zak a deal that will "help [him] master his Kur abilities." Zak agreed to the plan, though Argost has informed him that he has his own hidden agenda. Zak later told Doyle (in secret) to find out as much as he can about Argost's past. During a fight with an Ahuizotl in "The Thousand Eyes of Ahuizotl", Zak discovered that his powers enabled him to sense cryptids (as well as move around as though not blind-folded) without seeing them. In "Into the Mouth of Darkness" it was revealed that some cryptids such as Fisk love Zak because of his Kur power. Epsilon and Francis' people also think that Zak is "a time bomb waiting to explode" and insist that they help train him. Although he has aged 2 years, not much has changed about his appearance, although he has grown a bit taller. Zak is known as fearless, reckless and unpredictable. It is hinted that Zak has feelings for a thief girl named Wadi (stated in Curse of The Stolen Tiger and Life In The Underground).

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