Thurop Van Orman Flapjack, Boy No. 4 Voice, Writer Brian Doyle-Murray Captain K'nuckles Voice Roz Ryan Bubbie Voice Jeff Bennett Peppermint Larry, Lady Nickelbottoms, Slippery Pete Voice Jackie Buscarino Girl Guest Voice, Writer June Foray Kelly, Mother, Teacher Guest Voice Steve Little Dr. Barber, Lolly Poopdeck Voice, Writer Kent Osborne Boys Nos. 1 & 2 Guest Voice, Writer, Voice Director S. Scott Bullock Charles, Colonel Hagglebottoms, Captain Lasouarda, Patch Guest Voice Sean Szeles Writer, Writer Somvilay Xayaphone Writer John Infantino Writer, Writer Cole Sanchez Writer, Writer J.G. Quintel Writer