Dr. Z, the Alpha Gang's leader from the future, participated in Dr. Ancient and Dr. Cretacia's time travel mission to the Mesozoic era. During this mission, he secretly developed Move Cards and raised powerful "Secret Dinosaurs" for his ambition to become "Dinosaur King," disrupting operations and causing the timeship to crash in the present day. This scattered dinosaur cards worldwide and separated Rex from his parents, Dr. Ancient and Dr. Cretacia. Establishing the artificial island Zeta Point, Dr. Z directed the Alpha Gang to recover the cards. Initially egotistical, short-tempered, and prone to berating his subordinates (Ursula, Zander, Ed) while avoiding blame, Dr. Z also revealed a compassionate side. He adopted the Alpha Trio and Rod and Laura's father from an orphanage, raising them as his own. This paternal instinct extended to his Secret Dinosaurs, whom he tried to reunite with despite frequent rejection, and to his grandchildren Rod and Laura, whose safety triggered protective actions.

Betrayed by his comrade Seth in the first season's climax, Dr. Z was ejected from Zeta Point, forcing an alliance with the D-Team to counter Seth's Black T. rex. After Rex saved him from this creature, Dr. Z apologized for ejecting Rex's parents from the timeship. He aided in summoning dinosaurs to fight Seth's forces. Following the Black T. rex's defeat, it emerged Dr. Z might have secretly preserved Dr. Ancient and Dr. Cretacia in stasis aboard the timeship Backlander, possibly out of guilt. Confined for past actions, Dr. Z and the Alpha Gang were quickly drawn back into conflict when the Spectral Space Pirates attacked.

Season 2 forced Dr. Z and the Alpha Gang into continued partnership with the D-Team after the Pirates kidnapped the D-Team's parents. Dr. Z repaired the damaged Backlander timeship but accidentally sent it adrift without destination control, stranding Rod and Laura in the present. Crash-landing in the Cretaceous, Dr. Z initially reverted to old habits, attempting to use his dinosaur Terry against wild dinosaurs, but failed, reinforcing his reliance on the alliance. He contributed technologically, developing counters to the Pirates' Spectral Armor, including new Move Cards and Element Boosters enabling DinoTector Armor. He became more active in field missions, adopting personas like the pirate "Whitebeard" in the Caribbean, commanding a ship and engaging in comical disputes. His travels through historical eras—Ancient Rome, China, Persia, Japan—led to misadventures: being mistaken for a wizard, falsely claiming to be Sanzo Hoshi, or getting imprisoned. These highlighted his blend of self-serving antics and reluctant cooperation. Despite occasional villainous attempts, his actions increasingly aligned with the group against the Pirates and Seth, who had joined them. Dr. Z participated in the final battle against the Pirates and their evolved dinosaurs.

Dr. Z's personality combines zany egotism with moments of genuine, albeit often misguided, affection. He is stingy, claiming ownership over anything he desires, and easily intimidated into silence by his robotic maid Helga. His volatile temper and refusal to listen to opposing ideas persist, though he frequently appropriates others' suggestions. The paternal aspect remains consistent, showing in his pride for his Secret Dinosaurs and concern for his grandchildren. His development showcases a shift from primary antagonist to grudging ally, driven by circumstance rather than full redemption, yet his Season 2 actions reflect a capacity for cooperation and occasional selflessness within the ongoing conflict.