Evil Trigger is an evil Ultra Warrior who debuts in Ultraman Trigger: Episode Z as one of the main antagonists. He is described as "the one who inherits the shadow".
With cooperation from Celebro, Zabil managed to retrieve Kengo's GUTS Sparklence and GUTS Hyper Keys, hooking it up to the Eternity Core's altar, and then sacrificing the lives of his cultists to create an artificial "light" based on Trigger's data. Using the Ancient Sparklence, Zabil transformed into Evil Trigger, consumed by his desire to become a messianic figure for humanity.
Evil Trigger went on a rampage along with Ultraman Z, who was controlled by Celebro when he parasitised Haruki Natsukawa. To buy time for everybody else, Ignis transformed into Trigger Dark, but was starting to get overwhelmed by the duo. GUTS-Select also attacked using the GUTS Falcon and Nursedessei, but both were taken down by Evil Trigger, forcing them to attack from the ground with whatever artillery they had.