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He is first seen as an internet celebrity with his own channel called STOCKBOI. He was seen investigating the Gumbus until he was caught and captured. Leo, Mikey, and April go to the supermarket to prove or disprove the Gumbus' existence. Soon after investigating the place they soon find Baxter Stockboy who is surprised to see Turtles.
He also wants Mikey to subscribe and donate to him while also vloging until getting chained up by the Gumbus. Sometime later Stockboy appears as a living turkey who explains to April that if she destroy the turkey she would destroy his soul as well. He explains that the Gumbus will only disappear if they make a stack of cans and later using his phone to tell his viewers to subscribe and donate to him.
Leo, Mikey, and April later fight the Gumbus until it was revealed to be a robot hung by a string. After defeating the Gumbus it's shown that Baxter Stockboy was in control of the entire hoax to make money. He explains that the market is his parents store but they don't pay him so he decide to make videos to get more money and the trio destroys his phone to prevent his videos coming on to his channel. Enraged, Stockboy tries destroy them using his weapons but his parents show up and punish him for destroying the market, allowing the turtles and April to make an escape.
Al Be Back
Stockboy appears at the beginning of the episode where he brought Albearto's head to the rebuilt Albearto's Pizzeria in exchange for a cheat code on the dance machine.
The Mutant Menace
Stockboy gets arrested for nearly exposing the turtles for his crimes.
Stockboy is a smart for his age and can make robots to get people to give himself money. He also make make weapons that he attempt to use to destroy the Turtles and April.