Thurop Van Orman Flapjack, Merman No. 5, Sea Monster No. 5, Tall Constable, Captain K'Nuckles (Live Action) Voice, Writer, Director Brian Doyle-Murray Captain K'nuckles Voice Roz Ryan Bubbie Voice Jeff Bennett John, Merman No. 4, Peppermint Larry, Scoops Pennington, Sea Monster No. 3 Voice S. Scott Bullock Captain Lasouarda, Dashing Danny's Twin, Merman No. 1, Norm the Constable (Candy Bandit), Patch, Sea Monster No. 4 Guest Voice Grey DeLisle Frida Guest Voice Steve Little Lolly Poopdeck, Her-Doctor, Merman No. 3, Pirate Captain, Pirate Voice Daran Norris Dashing Danny, Merman No. 2, Sea Monster No. 2 Guest Voice Sarah Henzler Additional Voices Guest Voice Piero Piluso Writer Benton Connor Writer Tom King Writer Noel Belknap Writer John Infantino Writer, Assistant Director Dave Tennant Writer Sean Szeles Writer Margaret Tang Voice Director