Guest Stars Michael Cera voices Sal Viscuso Zandy Hartig as Nurse Dori Jordan Peele as Dr. Brian Rob Riggle as Dr. Brock Stryker Lennon Parham as Pharmacist Scott Aukerman as Desperate Dad Ian Roberts as Hoss O'Brien Matt Besser as Circus Clown David Haag as Kid Jack Coghlan as Young Child Charles Reisinger as Little Sick Kid