Thurop Van Orman Flapjack Voice, Writer Brian Doyle-Murray Captain K'nuckles Voice Roz Ryan Bubbie Voice Jeff Bennett Peppermint Larry, Cruise Officer, Historian, Private Investigator Voice Jackie Buscarino Ms. Leading Guest Voice, Writer Steve Little Dr. Barber Voice, Writer Dee Bradley Baker Monkey Guest Voice Adrián Viador Flapjack Guest Voice Pendleton Ward Writer Alex Hirsch Writer Patrick McHale Writer Somvilay Xayaphone Writer J.G. Quintel Writer Kent Osborne Writer Charlie Adler Voice Director