Zoe is Max's older sister who is occasionally dragged into her brother's adventures. Max doesn't think very highly of her, and often calls her dumb. She is rivals with her next door neighbor, Ben. She frequently becomes suspicious of her brother's travels, but Max puts her to sleep so she can't reveal their secret. She is usually reprimanded (and grounded) at the end of Max's travels, especially by her strict Dad, for her impish and mischievous behavior.