Sea monsters are rumored to be responsible for vanishing ships in the Seychelles.
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- Sonarman (single appearance)
- Captain Havel (first appearance)
- Squid (single appearance)
- Whale (single appearance)
- Harpooner 1 (single appearance)
- Whaler (single appearance)
- Harbor Master Javan (single appearance)
- Republic of Seychelles
- Christie Island
- Garcia Amirante
- Flare gun
- Questor catamaran
- Donder (destroyed)
|J.D. Roth||Jonny Quest|
|George Segal||Dr. Benton Quest|
|Robert Patrick||Race Bannon|
|Michael Benyaer||Hadji Singh|
Purvian sea captain
|Jim Cummings||Harpooner #1|
|Jim Meskimen||Captain Havel|
Harbor Master Javan
|Clive Revill||Harpooner 2|
- The name of the whaling ship was called the Donger in the first shot, before switching to Donder. Characters also called it the Donder.
- Jonny acts as if Captain Havel had died, but there was nothing to justify that, especially since he returns in Besieged in Paradise.
- The Real Adventures of Jonny Quest: Season One, Volume One DVD set released on February 17, 2009 by Warner Home Video.
Jonny: "I don't care who or what got that boat. I'm glad."
Dr. Quest: "If every scientist let his feelings get in the way of his work, Jonny, science would never advance."
Headji: "Some lead with the heart and others with the mind. Greater progress, however, comes with the unity of both."
Race: "Man, I wish I was a kid again, Benton."
Dr. Quest: "I thought you were, Race. I hadn't realized you'd ever grown up."