Jesse Bradford as Zak Gibbs

Paula Garcés as Francesca

French Stewart as Dr. Earl Dopler

Michael Biehn as Henry Gates

Robin Thomas as Dr. Gibbs

Julia Sweeney as Jenny Gibbs

Lindze Letherman as Kelly Gibbs

Jason George as Richard

Ken Jenkins as NSA Agent Moore

Tony Abatemarco as Administrator

Garikayi Mutambirwa as Meeker

Brian J. Williams as Car Salesman (uncredited)

Linda Kim as Jay

Esperanza Catubig as Ticket Agent

Jennifer Manley as Security Officer

Scott Thomson as Tourist Dad

Deborah Rawlings as Tourist Mom

Jodie Milks as Bright Freshman

Brad "Chip" Pope as Confused Freshman

Oanh Nguyen as Graduate Student

Andrew James Armstrong as Hot Skates Sports Boy

Rachel Arieff as Hot Skates Saleswoman

Joey Simmrin as Rick Ditmar

Finneus Egan as Ditmar's Friend

Pamela Dunlap as Vice Principal

Gina Hecht as Meter Maid

Eric Michael Baugh as Tagger

Dwight Armstrong as Nose-Ring Boy

DJ Midas as Flavius' Opponent

Billy Mayo as Q.T. Agent

Jenette Goldstein as Doctor

Jeff Ricketts as Officer Meyers

Melanie Mayron as Night Manager

Larry Carroll as Newscaster

Caroline Fogarty as Convention Worker

Miko Hughes as Young Dopler

Jonathan Frakes as Bystander

Rece Jones as Rave Dancer

Jon Alan Lee as Nerdy Convention Vendor

Joel Huggins as Nerdy Convention Vendor