Cristin Milioti Grace
Keegan-Michael Key Buddy the Unicorn (voice)
Topher Grace Ben
Patton Oswalt Strappy (voice)
Michael Shannon Willie (voice)
Clint Howard George
Eric Bauza Mr. Mailbox / Worry Well / Couchy / Trashy / Pee Flower (voice)
Delaney Quinn Freddy
Casper Kelly Writer, Director
Tristan Borders Oliver
J.D. Lifshitz Producer
Luke Speakman Josh
Caleb Williams Wade
Madison Polan Hannah
Bennie Taylor Mailman Miles
Phuong Kubacki Nurse Nancy
Adam J. Wilde Executive Producer
Raphael Margules Producer
Mac Smith Sound Designer, Supervising Sound Editor
Tony Villaflor Sound Re-Recording Mixer
Jonathan Yurco Dark Buddy (suit)
Rachel Appelbaum Clocky / Mr. Mailbox
Tory J. Malone Tyler
Eric Salazar Dad
Devon Hawkes Ludlow Charlie the Train (voice)
Bryson JonSteele Derek
Josh Ethier Editor
Tyler Davidson Producer
Zach Kuperstein Director of Photography
Jamie King Writer
Michael Yezerski Original Music Composer
Gideon Tadmor Executive Producer
Mark Aaron Buerkle Therapist (Day Player)
Sergey Zhuravsky Buddy the Unicorn (suit)
Marlowe Taylor Sound Mixer
Cedwan Hooks Betty Bunny (suit)
Tracy Rosenblum Producer
Drew Sykes Producer
Dexter Braff Executive Producer
Anna Kathleen Production Design
Seamus Flynn Timothy
Frank Brown Jr. Father
Emilio Schenker Executive Producer
Kevin Flanigan Executive Producer
Conner Stumm Mailman Justin
Lynette Eklund Puppeteer
Roberto Linck Executive Producer
Jimmica Collins Betty Bunny (voice)