Ep 3. Now Comes the Sub-Mariner

In the third episode of Fantastic Four's first season, entitled "Now Comes the Sub-Mariner," the titular heroes face off against one of Marvel's most iconic villains, Namor the Sub-Mariner.

The episode begins with Johnny and Ben trying to calm down a nervous Sue, who is worried about the team's capabilities in the face of their new opponent. Meanwhile, Reed is busy studying the ocean floor with his latest invention, a submarine that can withstand the intense pressure and heat of the deep sea. As he explores the underwater world, he comes across a strange energy source that he believes to be the key to Namor's power.

As the team regroups, they are suddenly attacked by Namor himself, who emerges from the ocean and destroys part of the city in the process. The Fantastic Four quickly spring into action, but find themselves outmatched by the Sub-Mariner's immense strength and durability. Things are further complicated when Namor reveals his true motive for attacking the city: to retrieve a powerful amulet that Reed had found during his exploration of the ocean floor.

With the amulet in hand, Namor gains even more power, and the Fantastic Four are forced to come up with a new plan to stop him. As they work together to find a way to neutralize his powers, the team begins to unravel the mystery of Namor's past and his connection to the undersea kingdom of Atlantis.

As the episode races towards its climax, the Fantastic Four find themselves in a desperate battle against Namor and his army of undersea creatures. With the fate of the city hanging in the balance, the team must overcome their own doubts and fears in order to emerge victorious.

In "Now Comes the Sub-Mariner," the Fantastic Four face one of their toughest challenges yet, as they go up against one of Marvel's most iconic villains. With stunning action sequences, breathtaking animation, and a gripping storyline, this episode is sure to thrill fans of the Fantastic Four and the wider Marvel universe.