A family of stonefish arrives in Quetzo and is shunned by the locals, who are afraid of their grotesque appearance and poisonous spikes. Dexter carelessly pricks himself on one of the fish, and reveals he has the only known cure for their poison. So when Nola accidentally treads on one of the stonefish, Lopaka begs Dexter for the antidote.

Dexter decides to improve his financial status by becoming mayor of Quetzo. When Flipper points out that a by-law insists the mayor must be married, Isolde, a jellyfish, disguises herself as a beautiful octopus, to trick him into marrying her. Flipper and Lopaka find out and stop the wedding at the last minute.