He was a young boy who was a big fan of the Ninja Turtles, so much that he wanted to be like them. In his initial appearance, he said to be "almost fourteen", however, he appears to be preteen through the whole series.
At first he was a nuisance to the Turtles, but eventually proved his skills and they affectionately called him their "Fifth Turtle".
He has an older brother named Walt, who picks on Zach for believing that the Turtles are real. He does meet them and, after proving himself a hero, becomes the "Sixth Turtle". Zach's parents are apparently aware of their sons' friendship with the Turtles.
He had an over-active imagination, as demonstrated in "Zach and the Alien Invaders".
- According to TV Tropes, the character of Zach was based on one of show's creator's children.
- "The Fifth Turtle"
- "The Great Boldini"
- "The Missing Map"
- "Bebop and Rocksteady Conquer the Universe"
- "Zach and the Alien Invaders"
- "Night of the Rogues"