Professor Poisson, a world-renowned oceanographer, is on a quest assigned to him by the museum to go and retrieve artifacts from a sunken ship named the Diablo Doro. Along with him, is Mystery Inc.; Shaggy, Scooby, Daphne, Velma and Fred. They are boarded on a ship named the Sea Prowler. But the boat's operator, Mr. Carp, warns the professor and the gang that Diablo Doro is guarded by the ghost of Captain Pescado and his sea monster crew. The professor tells the kids these are just stories, and then informs the captain that they are over the Diablo Doro. They drop anchor and go to bed. That night, Scooby, Freddy and Shaggy see Captain Pescado's ghost, a kelp monster, and an octopus monster outside their window in the ocean. He informs the girls and they go on deck to check it out. There, they find wet footprints leading onto the boat. Suddenly, Captain Pescado appears as well as the Kelp Monster, appears and chases the gang. They run into Professor Poisson and warn him. Mr. Carp and the deck hands board a life boat and decide to row to port because of the ghosts.
The next morning, the gang finds the professor's cabin ransacked, and Professor Poisson vanished. On the floor, is a secret code with the letter "IMCMMSC", their first clue. They decide to look for Professor Poisson. Scooby and Shaggy go into the galley and get locked inside by the octopus. Daphne, Velma and Fred get locked inside a room but manage to escape through a ventilation funnel. They look for Shag and Scoob, but get separated and Velma gets locked in the engine room. She climbs out through the smokestack where she is able to see the life boat that the the captain and the deck hands got in. The gang reunites and discovers the life boat is empty and battered, covered in kelp and wet footprints. They split up, Velma, Shag and Scoob go to the radio room to try and send a distress signal, and Fred and Daphne try to find the professor. Velma, Shaggy and Scooby send part of a distress message using Morse Code, but in doing do, they alert the kelp monster and the octopus. The two aquatic goons chase all three of them. Fred and Daphne witness Captain Pescado diving back down to the wreck and then meet up with Scooby, Shaggy and Velma.
Shaggy, Scooby, and Velma equip scuba suits and dive down to the Diablo Doro, and upon entrance, they discover air tanks, what does a ghost and sea monster need with scuba tanks? Scooby accidentally smashes through an old wall, and finds a treasure room-and the ghost and the sea monsters! Velma, Shaggy and Scooby are chased back up to the Sea Prowler. There they find the villains have gotten there first, and shoved Fred and Daphne into a closet. The ghosts then jump back into the water and they lift the submarine back into the hole, preventing the monsters from getting aboard. Velma explains that they must be taking the treasure from the wreck and hiding it on-board. With the help of metal detectors, they find the treasure locked up in the brig, along with a bound Professor Poisson. They try to go radio for help, but Pescado, the Kelp Monster, and the octopus climb on board via ladder and chase Velma, Daphne and the professor and Fred, Shaggy and Scooby manage to trap Pescado and the sea goons in a net. The coast guard arrive in time to witness the outcome; the Ghost of Captain Pescado is unmasked as Mr. Carr, and the Kelp and the Octopus Monster are unmasked as the deck hands. The scribbled note "IMCMMSC" is wrong. The I is a 1, making it "1MCMMSC". "1MC" stands for First Mate Carp and "MM" means McFinn and McGil, the two deck hands. The "SC" meant Professor Poisson was trying to write scuba divers before he was attacked. Mr. Carp was trying to steal the treasure from the wreck and haul it back on board, the air tanks that Velma, Scooby and Shaggy saw proved that the alleged ghosts they had seen weren't ghosts.
Scooby gets a laugh from wearing the treasures from the Diablo Doro, after Shaggy calls hims the "six million dollar dog".
- Professor Poisson (single appearance)
- Mr. Carp (single appearance)
- Mr. McFinn (single appearance)(no lines)
- Mr. McGil (single appearance)
- Ghost of Captain Pescado (single appearance)(Mr. Carp's disguise)
- Kelp Monster (single appearance)(no lines)(Mr. McFinn's disguise)
- Octopus Monster (single appearance)(no lines)(Mr. McGil's disguise)
- Captain Francisco Pescado (only time mentioned)(deceased)
- Flying fishes (single appearance)(no lines)
- Shark (single appearance)(no lines)
- Coast guard officer (single appearance)
|Mr. Carp||Warned the gang that the Diablo Doro is guarded by the Ghost of Captain Pescado.|
| Mr. Carp as the Ghost of Captain Pescado|
Mr. McFinn as the Kelp Monster
Mr. McGil as the Octopus Monster
|To steal treasure from the sunken ship.|
The following credits reflect closely as possible to how they are seen on-screen.
- Executive Producers: Joseph Barbera and William Hanna
- Director: Charles A. Nichols
- Creative Producer: Iwao Takamoto
- Associate Producer: Alex Lovy
- Storyboard Direction: Jan Green, Cullen Houghtaling, Don Sheppard, Paul Sommer
- Recording Director: Alex Lovy
- Story Editor: Ray Parker
- Story: Larz Bourne, Haskell Barkin, Dick Conway, Tom Dagenais, Willie Gilbert, Tony DiMarco, Duane Poole, Dave Ketchum, Norman Maurer, Dick Robbins, Dalton Sandifer
- Voices: Bob Holt, Allan Melvin, Casey Kasem, Don Messick, Pat Stevens, Janet Waldo, Mickey Dolenz, Linda Hutson, Virginia Gregg, Hettie Lynn Hurtes, Shirley Mitchell, Heather North, Alan Oppenheimer, John Stephenson, Lennie Weinrib, Frank Welker
- Production Design: Bob Singer
- Character Design: Alex Toth
- Production Supervisor: Victor O. Schipek
- Graphics: Iraj Paran
- Musical Director: Hoyt Curtin
- Musical Direction: Paul DeKorte
- Layout: Mike Arens, Hak Ficq, Jack Huber, Ray Jacobs, Tony Rivera, Jim Mueller, Tony Sgroi, Terry Slade, Owen Fitzgerald, C.L. Hartman, Alex Ignatiev, Ziggy Jablecki, Homer Jonas, Warren Marshall, Steve Nakagawa, Bob Singer, Linda Rowley, Adam Szwejkowski, Wendell Washer, Al Wilson, George Wheeler
- Unit Director: Bill Keil
- Animation: Ed Barge, Bob Goe, Bill Hutten, Tony Love, O.E. Callahan, Lars Calonius, Rudy Cataldi, Steve Clark, Hugh Fraser, Bob Hathcock, Jerry Hathcock, Volus Jones, Ken Muse, Rod Parkes, Veve Risto, Jay Sarbry, Xenia, Margaret Nichols, Don Patterson, Morey Reden, Ed Soloman, Ken Southworth, Dave Tendlar, Dick Thompson, Carlo Vinci, Russ Von Neida
- Backgrounds: Fernando Arce, Dennis Durrell, Al Gmuer, Richard Khim, Fernando Montealegre, Marilyn Shimokocki, Dennis Venizelos
- Technical Supervisor: Frank Paiker
- Checking and Scene Planning: Evelyn Sherwood
- Ink and Paint Supervisor: Billie Kerns
- Xerography: Star Wirth
- Sound Direction: Richard Olson, Bill Getty
- Supervising Film Editors: Chip Yaras
- Music Editors: Larry Cowan, Pat Foley, Joe Sandusky
- Effects Editors: Richard Allen, Tom Gleason, Terry Moore
- Negative Consultant: William E. DeBoer
- Post Production Supervisor: Joed Eaton
- Camera: George Epperson, Curt Hall, Ron Jackson, Norman Stainback, Roy Wade
- Production Manager: Jayne Barbera
- A Hanna-Barbera Production
- © 1976 Hanna-Barbera Productions, Inc.
- RCA Sound Recording
- Hanna-Barbera Productions, Inc.
- The Mystery Machine is not in this episode, as the gang are out at sea for the entire episode.
- Many of the characters that are in this episode have names that are related to fish:
- Carp is a type of fish.
- Gil (although spelled "Gill") is what lets a fish breathe underwater.
- Finn (although spelled "Fin") is what lets a fish move easier underwater.
- Pescado is Spanish for fish.
- Poisson is French for fish.
- Velma learned morse code in the girl scouts.
Animation mistakes and/or technical glitches
- When Carp is unmasked his hair is black instead of brown.
Inconsistencies/continuity errors and/or goofs/oddities
- None known.
In Other Languages
|German||Scooby Doo, Wo ist die Crew?||Scooby Doo, Where is the Crew?|
|Polish||Scooby i Skarb Piratów||Scooby and the Pirate Treasure|
|Italian||L'Equipaggio Svanito||The Crew Vanished|
- The Scooby-Doo!/Dynomutt Hour: The Complete Series DVD set released by Warner Home Video on March 7, 2006.
Shaggy: Milk, syrup, butter... (notices all of the pancakes are gone) Did you eat all the pancakes, Scooby?!
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|There's a Demon Shark in the Foggy Dark|| The Scooby-Doo Show|
|The Ghost that Sacked the Quarterback|