He first appears in "Overnight Success", as one of the schoolmates that Lincoln invited to his sleepover, but because of Lincoln's sisters, he refuses to stay at his house.
He appears again in "Lincoln Loud: Girl Guru", where he is one of the many boys seeking advice about girls from Lincoln. Lincoln then suggests he learn basic chemistry in order to get Kat to like him, much to his displeasure. Later, he accidentally burns Kat's braids in attempt to impress her with his chemistry skills. He then points to Lincoln, saying he told him to do it.
In "Dance, Dance Resolution", Zach, alongside Liam, and Rusty Spokes, are seen unsuccessfully trying to get dates for the school's Sadie Hawkins dance. Later, at the dance, Lincoln and Clyde recruit the trio's assistance, by having them handle the former's four dates, while Lincoln tries to hide from Ronnie Anne. Zach ends up having a good time with Giggles.
Zach is a short kid with red messy hair, glasses, buck teeth, and freckles on his cheeks. He wears a white-and-blue striped polo shirt, blue jeans, and white sneakers.
Episodes where Zach is the main focus