Keegan-Michael KeyBuddy the Unicorn (voice) Michael ShannonCharlie the Train (voice) / Willie (voice) Patton OswaltStrappy (voice) Clint HowardGeorge (voice) Sergey ZhuravskyBuddy the Unicorn Bennie TaylorMailman Miles Mark Aaron BuerkleTherapist (Day Player) Conner StummMailman Justin Rachel AppelbaumClocky / Mr. Mailbox Cedwan HookBetty Bunny Puppeteer Casper KellyDirector / Escritor Raphael MargulesProductor Kevin FlaniganProductor ejecutivo Dexter BraffProductor ejecutivo Roberto LinckProductor ejecutivo Emilio SchenkerProductor ejecutivo Gideon TadmorProductor ejecutivo Adam J. WildeProductor ejecutivo Zach KupersteinDirector Of Photography Michael YezerskiCompositor de música original 
