Isla Fisher Sarah Hatoff (voice)
Stephen Root Grampa (voice)
Pete Davidson Petey the Cat (voice)
Ricky Gervais Flippy (voice)
Maggie Wheeler Nurse (voice)
Billy Boyd Seamus (voice)
Poppy Liu Butler (voice)
Lil Rel Howery Chief (voice)
Scott Menville 3D Guy (voice)
Kate Micucci Dippy (voice)
Cam Clarke Indifferent Shop (voice)
Laraine Newman Scientist (voice)
Kelly Stables Harold (voice)
Gary A. Hecker Foley Supervisor
Max Koch Rocco (voice)
Cheri Oteri Mayor (voice)
John Eric Bentley Living Spray Factory (voice)
Gary Rizzo Sound Re-Recording Mixer
Kevin McCann Grump (voice)
Melissa Villaseñor Realtor (voice)
Luenell Milly (voice)
Dav Pilkey Executive Producer, Book
Rahnuma Panthaky Doctor (voice)
Peter Hastings Dog Man / Officer Knight / Harold's House (voice), Director, Writer
Skip Stellrecht Ice Cream Building (voice)
Kimberly Bailey Gym (voice)
Yung Gravy Mr. Whiskers (voice), Songs
Mike Horton Foley Artist
Christi Soper Hilt Casting
Brian Hopkins Editor, Big Jim (voice)
Warren Sroka Apartment Building (voice)
Pearce Bunting Cheesesteak Guy (voice)
Tom Howe Original Music Composer
Jeff Gross Foley Mixer
Nate Wragg Production Design
Lucas Hopkins Calderon Li'l Petey (voice)
Jana Schmieding Janet (voice)
Hanna Kim Story Artist
Evan Rogers Orchestrator
Karen Foster Robot (voice), Producer
Georgia Simon Hospital (voice)
Jeremy Bernstein Story Artist
Adam Rosette Story Artist
Percy Rustomji Surfer (voice)
Shabrayia Cleaver Associate Producer
Anthony Zierhut Head of Story
Daniel Tal Additional Storyboarding
Arran Jay Baker Lead Animator
Carder Scholin Story Artist
Marceline Tanguay Story Artist
Chris Heltzel Story Artist
Tim Gibson Animation Supervisor
Gaël Matchabelli Lead Animator
Andrea Ferrara Lead Animator
Aziz Kocanaogullari Lead Animator
Sarah Gold Amburgey Story Artist
Daria Khil Additional Storyboarding
Cassandra Fanning Digital Supervisor
Bianca Margiotta Associate Producer
Christopher Zibach Art Direction
Camryn Del Vecchio Additional Storyboarding
Scott Cullen Head of Layout
Emma Porter Lead Animator
Sonny Onorati Radio Building (voice)
Valentin Beaumont Visual Effects Technical Director