Zack

Zack Mcneil - (ザック マクニール) is the other main character, he is American, and he is Zim's year old brother and the son of Lara and Russel Mcniel.

History
Zack was hatched out of his egg at home in Lara's arms in spring 1989. Russel was sitting down on the bed, watching Zack hatch. As a year went by, Zack got a little brother, Zim. He was the first one to see him when he hatched out of his egg at the Willville City Campground. His best friends are Zim, Tak, Shimmer, Gordan, and Dayne, and has a crush on Mckenna.

In 1993, at the age of 4, and Zim, aged 3, met Todd at preschool on the first day. He also met Debby, his first crush. In 1997, they met Gordan and Dayne, on the first day of school when Gordan and Dayne were the new kids.

Zim Zack and Tak 2
Before Zim, Zack, and Tak could walk out of their home, Lara hugged her boys tightly and sobs. Zack starts to cry a bit, even Zim. On their way to the air port, Zim, Zack, and Tak get stuck in a traffic jam but they do make it to the Airport. But Zack was the one who keeps getting sick after they were forbidden to ride the plane with Tak. His first view of one of the new friends was Millie when she got home from shopping with her sister, Margo.

Personality
Zack can be very witless in all school subjects, (Mostly math), but he can be more serious then Zim. He's very friendly, and loves basketball.