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