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