As Hamza and Farah go with their grandfather to Al Mahmeyah, the grandfather and Farah start cleaning it. Hamza discovers that the marine creatures in Al Mahmeyah speak like humans.
Coca comes to reassure the residents of Al Mahmeyah that Hamza and Farah are not hunters. Shark plots to bother Haris for entering Al Mahmeyah.
Saree goes to Haris to tell him about Shark's plot, but he arrives after Haris is injured. Hamza and Farah plug the hole to protect Al Mahmeyah from Shark's entry.
Shark tries to dig a hole again to enter Al Mahmeyah; meanwhile, Farah comes up with the idea of setting an alarm to warn Al Mahmeyah of Shark's danger.
Zaghloul helps Boussy and Inaba escape from Shark, and as the latter breaks into Al Mahmeyah, Farah and Hamza stand up to him.
The little fish go on a trip outside Al Mahmeyah, including Bebo, who unfortunately meets Shark.
As Farah and Hamza go outside Al Mahmeyah to look for Bebo, they go to the dark cave and manage to save him and return.
When a leak occurs in an oil ship in Al Mahmeyah, Hamza comes to save the people of Al Mahmeyah and takes the oil out of the water.
As wild piranhas go towards Al Mahmeyah, Dolphin goes to warn the people. Hamza and Farah rush to save Al Mahmeyah from the piranhas with black pepper, but the octopus Hakim gets injured.
As Farah and Hamza come up with a solution to treat Hakim with an orange flower from the depths of the sea, the duo enters a cave to find the rare flower, but Shark chases them.
Hamza and Farah escape from Shark and go to give Hakim the orange flower to treat him, upon which he gets cured of his illness.
A little frog comes and makes a noise next to Farah, who discovers that he is looking for his mother, so she helps him find her.
Inaba accidentally smashes Boussy's mirror, so Inaba thinks that Boussy wants to abandon her and decides to leave Al Mahmeyah. Saree tells Boussy that Inaba has left Al Mahmeyah.
As the residents of Al Mahmeyah ask Hamza and Knouz to find Inaba, the duo reaches her and succeeds in convincing her to return.
As Nadim the fisherman comes to visit Haris and check on him, the latter warns Farah of Nadim, who tries to catch fish inside Al Mahmeyah without anyone seeing him.
Nadim destroys some of the coral reefs in Al Mahmeyah after entering with a boat to fish. The residents of Al Mahmeyah gather to help Hamza and Farah get the boat out of the place.
Shark plots to break into Al Mahmeyah while everyone is sleeping inside, but Najma finds out about the plan and goes to warn Hakim.
Shark and Zaghloul enter Al Mahmeyah and start attacking the creatures inside. However, Hamza and Farah stand up to them and succeed in kicking them out.
Shark discovers the password of Al Mahmeyah's network and plans to break into it again, so he asks Sultan to enter a Haris' house and steal Farah and Hamza's watches.
Haris asks Farah and Hamza to light the lighthouse so that the ship can know the way back due to the storm. Farah and Hamza succeed in their mission, and the ship returns. Sultan goes to steal Hamza and Farah's watches.
As Shark and Zaghloul enter Al Mahmeyah with Sultan's help, Shark attacks Al Mahmeyah's creatures, locks them in an aviary, and then takes them to the cave.
Hamza and Farah discover that the alarm watches have disappeared, and Coca informs them of Shark's abduction of Al Mahmeyah's creatures; however, they succeed in saving everyone from Shark's clutches.
Farah changes the gate password to prevent Shark from entering again. Nadim tries to hunt a blue whale, so Dolphin goes to Farah and Hamza, and they save the whale from Nadim.
Hamza and Farah decide to clean Al Mahmeyah from plastic and waste to save the marine creatures, and it turns out that Nadim is the one who threw the garbage in Al Mahmeyah to take revenge on Haris.
Nadim again throws garbage on Al Mahmeyah's beach, upon which Bebo gets into a plastic bottle and fails to get out, so Hamza and Farah go to rescue him.
Farah sets a trap to discover who wants to destroy Al Mahmeyah by dumping garbage daily and finds out that Nadim is the culprit, so she and Hamza threaten him to destroy his boat.
Nadim hunts Boussy and Inaba, so Saree goes to tell Hakim and the people of Al Mahmeyah, and they summon Farah and Hamza to help them.
Hamza and Farah try to deceive Nadim by making a deal to give him Boussy and Inaba in exchange for money. Meanwhile, Cookie helps Boussy and Inaba escape.
Nadim decides to take revenge on Farah and Hamza. Shark refuses to surrender and insists on storming Al Mahmeyah. Hakim advises the creatures of Al Mahmeyah not to leave it for fear of them.
Hamza and Farah remember all the situations that happened to them in Al Mahmeyah and their rescue of the creatures there, so Hakim gives them medals of black pearls for their efforts.