Starring Cast
Key crew
Director
Screenplay
Producers
Music
Editor
Production design
Marcin Jakubowski
Casting
Full cast
54 cast membersCharles Osgood
Narrator (voice)
Shelby Adamowsky
Hedy / Hooly (voice)
Caitlin Rose Anderson
Helen (voice)
Christina Martino
Heidi / Haley (voice)
Ellie Martino
Hanna (voice)
Connor Anderson
Who Child #1 (voice)
Crew by department
63 crew membersWriting
Cinco Paul
Screenplay
Ken Daurio
Screenplay
Cal Brunker
Story Artist
Chris Renaud
Story Artist
Eric Favela
Story Artist
Jeff Biancalana
Story Artist
Jony Chandra
Story Artist
Karen Disher
Story Artist
Martin Fuller
Story Artist
Moroni Taylor
Story Artist
Rafael Zentil
Story Artist
Tony Maki
Story Artist
William H. Frake III
Story Artist
Ricardo Curtis
Head of Story
Jon Vitti
Story Consultant
Chris Gilligan
Additional Storyboarding
Crystal Chesney-Thompson
Additional Storyboarding
Edmund Fong
Additional Storyboarding
Frank Marino
Additional Storyboarding
J.G. Quintel
Additional Storyboarding
Jeff Siergey
Additional Storyboarding
Rich Moore
Additional Storyboarding
Stephanie Arnett
Additional Storyboarding
Wilbert Plijnaar
Additional Storyboarding
Production
Camera
Editing
Sound
Art
Thomas Cardone
Art Direction
Marcin Jakubowski
Production Design
Visual Effects
Paul Downs
Animation
Galen T. Chu
Visual Effects
Michael Thurmeier
Visual Effects
Alen Lai
Senior Visual Effects Supervisor
Jamie Kirschenbaum
Senior Visual Effects Supervisor
Rhett Collier
Senior Visual Effects Supervisor
Simon Brown
Senior Visual Effects Supervisor
Casting
Other
Dr. Seuss
Book
Guillermo Willie Real
Set Designer
Jake Parker
Set Designer
Kyle Macnaughton
Set Designer
Lizette Vega
Set Designer
Michael Knapp
Set Designer
Nash Dunnigan
Set Designer
Barry E. Jackson
Visual Development
Tansal Arnas
Schedule Coordinator