Special Guest Stars Meghan Trainor voices Rainbow Guest Stars Doug Murray voices Mailbox Shazdeh Kapadia voices Side Table Drawer Brad Adamson voices Mr. Salt Jacob Soley voices Slippery Soap Jordana Blake voices Pail Leo Orgil voices Shovel Jacob Soley voices Raindrop Co Starring Molly Lewis as Josh's Friends Elle Simons as Josh's Friends Lucien Duncan-Reid as Josh's Friends River Price-Maenpaa as Josh's Friends