Cast[]
- Owen as Arthur
- Mosy the Mosasaurus as DW
- Audrey (from The Lorax (2012)) as Kate
- Barry as Mr. Read
- Rexy as Mrs. Read
- Ted (from The Lorax (2012)) as Pal
- Gray as Buster
- Vivian as Francine
- Claire as Muffy
- Benji Applebaum (from Pitch Perfect) as Brain
- Zach as Binky
- Balto (from Balto) as George
- Scott as Mr. Ratburn
- Fred Flintstone (The Flintstones Movie) as Mr. Morris
- Charlie as Fern
- Echo as Sue Ellen
- Lowery as Grandpa Dave
- Blue as Nadine
- Vic Hoskins as Rattles
- Wilma Flintstone (The Flintstones Movie) as Molly
- Simon Masrani as Ed Crosswire
- Nanny McPhee (from Nanny McPhee) as Paige Turner
- E.B's Dad (from Hop) as Bionic Bunny