 | Jennifer Garner als June's Mom (voice) |
 | Matthew Broderick als June's Dad (voice) |
 | John Oliver als Steve (voice) |
 | Mila Kunis als Greta (voice) |
 | Kenan Thompson als Gus (voice) |
 | Ken Jeong als Cooper (voice) |
 | Norbert Leo Butz als Peanut (voice) |
 | Brianna Denski als June (voice) |
 | Ken Hudson Campbell als Boomer (voice) |
 | Sofia Mali als Young June (voice) |
 | Oev Michael Urbas als Banky (voice) |
 | Kevin Chamberlin als Uncle Tony (voice) |
 | Kate McGregor-Stewart als Aunt Albertine (voice) |
 | Kath Soucie als Bus Counselor Shannon (voice) |
 | Lisa Foiles als Additional Voices |
 | Tom Baker als Boomer (voice) |
| Alonzo Ruvalcaba | Associate Producer |
| Ignacio Pérez Dolset | Producer |
| Steven Price | Original Music Composer |
| Josh Appelbaum | Producer |
| Kendra Haaland | Producer |
| André Nemec | Producer |
| Alice Dewey | Co-Producer |
| Don Hahn | Executive Producer |
| Ben Rosenblatt | Co-Producer |
| Karen Rosenfelt | Executive Producer |
| Geoffrey Stott | Associate Producer |
| Edie Ichioka | Editor |
| Josh Appelbaum | Story |
| Josh Appelbaum | Screenplay |
| André Nemec | Story |
| André Nemec | Screenplay |
| Robert Gordon | Story |
| Juan García Gonzalez | Cinematography |
| Margery Simkin | Casting |
| Fred Warter | Production Design |
| Helen Mingjue Chen | Art Direction |
| Lou Romano | Art Direction |
| Aaron Dem | Co-Producer |
| Lorien McKenna | Associate Producer |
| Connie Nartonis Thompson | Associate Producer |
| Darren T. Holmes | Additional Editing |
| Christopher Appelhams | Storyboard Artist |
| Betsy Bauer | Visual Development |
| Peter Chan | Visual Development |
| David Colman | Storyboard Artist |
| Mark Dindal | Story Artist |
| Russ Edmonds | Story Artist |
| Dylan Brown | Director |
| Alfonso Casado Diez | Production Assistant |
| Matteo Veglia | Production Assistant |
