Toxic Ace debuted in Shadow, where he emerged from the destroyed mining facility's debris and encountered Dr. Emmanuel Klipse and Hargrave, only to be captured by the duo off-screen.
In Life, he was shown at the end confined inside a cage made entirely of Monsuno Essence, being observed by Dr. Klipse and Hargrave.
In Monster, he was released from his cage by Dr. Klipse and roamed towards Isemon, where he followed Team Core-Tech to the city's sewers. While inside the sewers, Toxic Ace captured and tied up Chase, Beyal, and Jinja. When Jeredy Suno, Bren, and Dax came to rescue the three, Toxic Ace showed himself and easily defeated Dax's Airswitch. When Toxic Ace attempted to finish off Airswitch, he was stopped by Dr. Klipse, who had activated a control mechanism on Ace's back. Toxic Ace's origin was explained to Team Core-Tech, and then a battle broke out between both groups. Even though he was assisted by Backslash and Firewasp, Toxic Ace took down all five Core-Tech Monsunos by himself, until Lock entered the battle and blasted Ace into the water. However, Toxic Ace quickly rejuvenated, and when all of the Monsunos returned to their Cores, Ace attempted to capture Jeredy. Toxic Ace was then blown away by Jinja's taser, which caused a portion of the sewer to cave in. Toxic Ace quickly recovered once again and managed to capture Jeredy, leaving with Dr. Klipse and Hargrave.
In Endgame, he was kept in his cage right next to a chained Jeredy Suno, who tried to get through to the real Jon, but failed. Toxic Ace then observed the massive battle royale between Team Core-Tech, Eklipse, and the Desert Wolves from his cage.
In Rising, he finally broke free from Dr. Klipse's control after Jeredy reasoned with him about what the old Jon would do. Toxic Ace then guided Jeredy to safety after Klipse's flying fortress crashed and before the Fusion Core Reactor's explosion. Toxic Ace and Jeredy then met up with Team Core-Tech following the end of the battle with Eklipse and S.T.O.R.M..