Flapjack is a boy who was found and raised by Bubbie, a talking whale. Flapjack is very naive and oblivious to danger, thus he is easily caught up in perilous situations. He holds K'nuckles in extremely high regard, with his affection for the captain sometimes bordering on obsession. His catchphrase is "Adventure!" (said whenever excited). He is voiced by series creator Thurop Van Orman. During the ending of the final episode, Thurop's son Leif plays the role of Flapjack. Flapjack's original voice actor was meant to be Paul Reubens, but Reubens never showed up to any recording sessions.