The gang meet Sonny and Cher. After being stranded on shark island, the gang decide to investigate the mysterious disappearance of a freight ship.


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Episode credited cast:
Don Messick ...
Scooby-Doo (voice)
Shaggy (voice)
Fred (voice)
Heather North ...
Daphne (voice)
Nicole Jaffe ...
Velma (voice)
Rest of cast listed alphabetically:
Himself (voice)
Herself (voice)
Joan Gerber ...
Larry Harmon ...
(voice) (as Pat Harrington)


The gang meet Sonny and Cher. After being stranded on shark island, the gang decide to investigate the mysterious disappearance of a freight ship.

Plot Summary | Add Synopsis

Plot Keywords:

shark | See All (1) »





Release Date:

28 October 1972 (USA)  »

Company Credits

Production Co:

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Technical Specs

Sound Mix:

(RCA Sound Recording)


Aspect Ratio:

1.33 : 1
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Did You Know?


When the gang is driving across the bridge to Shark Island, a big truck passes them and the Mystery Machine hangs off the edge. Fred asks if anyone go the license number and Sonny Bono says, "No, but I'd recognize that dirty laugh anywhere." Sonny's lips don't move when he replies to Fred. See more »


Sonny Bono: This brochure says that the gulls and the pelicans around here are so tame, you can feed them, and they'll eat off your hand.
Velma: Those birds'll eat off your hand all right, they're vultures!
See more »


References The Hound of the Baskervilles (1939) See more »

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User Reviews

The Secret of Shark Island
20 December 2013 | by (Louisville, KY) – See all my reviews

The New Scooby-Doo Movies (1972)

"The Secret of Shark Island"

The Mystery Inc. gang are driving through a rain storm when they pass Sonny and Cher who are stranded on the side of the road. The famous couple jump into the van and everyone heads to a hotel, which is broken down to say the least. They learn that there are some mysterious sharks that circle the hotel and soon there's a mystery to be solved. The Secret of Shark Island is yet another rather disappointing entry in the series that manages to have no mystery, very few laughs and really not too much working for it. There are several problems here but the majority can be blamed on the script, which really doesn't offer up anything in terms of entertainment. The laughs are pretty much missing and this includes the constant back and forth between Sonny and Cher. Their one-liners are all pretty bad and there's just no chemistry between the two. The gang really doesn't add any laughs either, although Scooby gets a couple good lines scattered throughout the running time. The actual mystery is also pretty bland because it's quite obvious who the bad guy is and the costumes of the sharks just aren't used enough.

Episode: C

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