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 rescues Donald Duck whose inflatable water-mattress has 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.
Moby Duck only made one animated appearance, in the Walt Disney's Wonderful World of Color episode "Pacifically Peeking" (October 6, 1968). In this cartoon, it was first revealed that Moby is Donald Duck's cousin. However, his popularity skyrocketed and he got a major starring role in his own comic book series starting in October 1967.
In the early 2000s, Moby was given his own series of Italian comics, called Le storie della Baia (Stories from the Bay). In this series, Moby has lost his sailing boat in a storm and teams up with Fethry Duck, with whom he gets involved in grand adventures. Here, Moby was also given a new animal friend called Trippa, an unusually hungry seagull, and many new friends who help him and Fethry on their journies. In addition, Moby was given two arch-enemies: the rich Azimuth Von Quack and his dimwitted servant Sagola.
- 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.