Zack Jacobs

"You know, Dad was full of shit, Mom was kind of full of shit, and Max is full of shit. But I never felt that way towards you, Mikey. Just give me this one last chance to make up for all the time I have been away."

- Zack to Jester after Jester yells at him

''This is the original version of Zack Jacobs. For the Season 4 character that has the same voice actor as Zack, see Unnamed Season 4 Protagonist.''

Zack Jacobs (born c. 1996) is the brother of Michael Jacobs and Max Jacobs, and the son of an unnamed father and a late unnamed mother.

He is voiced by William Brent (Billy Unger), who also portrayed Chase Davenport in Lab Rats and Lab Rats: Elite Force.