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