Moby Duck is a salty seafaring captain of a whaling tug that often carries cargo for Scrooge McDuck and is an occasional staff employee of his. He also often takes various members of the Duck Family on adventures. He first appeared in the comic story "A Whale of an Adventure" (Donald Duck #112, March 1967), when he rescued Donald Duck whose inflatable water-mattress had drifted out to sea. Donald briefly served as his First Mate, but was soon replaced by Dim-Witty Duck. Never far away is Moby's loyal pet porpoise, Porpy (whose intelligence is obviously far greater than Dim-Witty's). Moby has a remarkable knowledge of the sea which serves him well. He is also scrupulously honest and responsible. It is unclear whether he and Dim-Witty are members of the Duck Family.
Moby Duck only made one animated appearance in the Walt Disney's Wonderful World of Color episode "Pacifically Peeking" (October 6, 1968). However, his popularity skyrocketed that he got a major starring role in his comic book series starting in October 1967.
One of Moby Duck's adventures was examined by the Mythbusters; specifically, the use of ping-pong balls to raise a sunken ship from the depths.