The episode begins with Fry, Leela, and Bender on a delivery mission to the southern region of the Earth, specifically to a place called the "Deep South." As they travel, Fry expresses his excitement about the prospect of seeing the South, which he imagines to be a land of charm and hospitality. However, Leela is skeptical and warns Fry that the South has a reputation for being dangerous and filled with strange creatures.

As they approach their destination, the crew's ship, the Planet Express Ship, experiences a malfunction and crashes into a swamp. The crash leaves them stranded in a murky, swampy area. Fry, eager to explore, convinces Leela and Bender to venture out of the ship with him. They begin to wander through the swamp, encountering various oddities and strange creatures, including a giant alligator.

While exploring, they stumble upon a hidden underwater city inhabited by mermaids. The mermaids are initially wary of the newcomers but are intrigued by Fry, who is enamored with their beauty. The leader of the mermaids, a character named "Mermando," takes a particular interest in Fry, leading to a series of humorous interactions. Fry is captivated by the mermaids and their underwater lifestyle, while Leela and Bender remain skeptical of their intentions.

As Fry spends more time with the mermaids, he learns that they are facing a crisis. Their home is threatened by pollution from the surface world, and they are in desperate need of help. Fry, feeling a sense of responsibility and wanting to impress the mermaids, decides to take action. He rallies Leela and Bender to assist him in finding a solution to the pollution problem.

The trio devises a plan to confront the source of the pollution, which they discover is a factory owned by a greedy businessman. They infiltrate the factory, where they encounter various obstacles and challenges. Bender uses his skills to disable the factory's machinery, while Leela navigates through the complex to find the main control room. Fry, motivated by his desire to help the mermaids, pushes forward despite the dangers.

During their infiltration, they face off against security guards and automated defenses. A series of comedic yet tense moments ensue as they evade capture and sabotage the factory's operations. Eventually, they reach the control room, where they confront the factory's owner. A confrontation ensues, and Fry passionately argues for the mermaids' right to a clean environment. The owner, initially dismissive, is taken aback by Fry's determination and the evidence of the pollution's impact.

After a heated exchange, Fry's sincerity and the visual evidence of the mermaids' plight sway the factory owner. He reluctantly agrees to implement changes to reduce pollution and help restore the mermaids' home. The crew celebrates their victory, and the mermaids express their gratitude to Fry, Leela, and Bender for their help.

As the episode concludes, Fry reflects on his adventure and the friendships he has formed with the mermaids. He feels a sense of fulfillment from having made a difference, while Leela and Bender share in the camaraderie of their successful mission. The trio returns to the surface, ready to continue their adventures, leaving the underwater city behind but forever changed by their experience.

In the ending of "The Deep South," Fry, Leela, and Bender discover that the lost city of Atlanta is actually a city of intelligent, anthropomorphic fish. They learn that Fry's beloved pet, Seymour, has been transformed into a fish and is now living in the city. After a series of events, Fry decides to leave the city with Leela and Bender, but he is heartbroken to leave Seymour behind. The episode concludes with Fry reflecting on his past and the bond he shared with Seymour, ultimately accepting that he must move on.

As the episode draws to a close, Fry, Leela, and Bender find themselves in the underwater city of Atlanta, a vibrant and bustling metropolis inhabited by anthropomorphic fish. The trio has been on a quest to find Fry's lost pet, Seymour, and their journey has led them to this unexpected destination. The city is filled with colorful coral structures and schools of fish swimming gracefully through the water, creating a surreal and enchanting atmosphere.

Fry is filled with a mix of excitement and anxiety as they explore the city. He is hopeful that he will find Seymour, but there is an underlying tension as he grapples with the possibility that his pet may have changed beyond recognition. As they navigate through the streets, they encounter various fish citizens, each with their own unique personalities and quirks, adding to the whimsical nature of the underwater world.

Eventually, they come across a large gathering where a fish version of Seymour is being celebrated as a hero. Fry's heart races as he realizes that this fish is indeed Seymour, transformed but still recognizable. The emotional reunion is bittersweet; Fry is overjoyed to see his old friend but is also struck by the reality that Seymour has adapted to his new life in the underwater city. Fry's internal conflict deepens as he realizes that he cannot take Seymour back to the surface world, where he belongs.

Leela and Bender watch as Fry struggles with his emotions. Leela, always supportive, encourages Fry to cherish the memories he has of Seymour, while Bender, in his typical fashion, tries to lighten the mood with humor. However, the weight of the moment is palpable, and Fry's heartache is evident as he contemplates leaving Seymour behind.

As the time comes for them to depart, Fry takes one last look at Seymour, who seems to recognize him and swims closer. Fry reaches out, but the reality of their separation sinks in. With a heavy heart, he turns away, knowing that he must move on. The trio swims back to the surface, leaving the vibrant city of Atlanta behind.

In the final moments of the episode, Fry reflects on the bond he shared with Seymour, realizing that while they may be apart, the memories of their time together will always remain with him. The episode closes with Fry, Leela, and Bender surfacing, the sun shining brightly above them, symbolizing a new beginning for Fry as he learns to let go of the past while cherishing the love he had for his pet. Each character leaves the underwater adventure changed in some way, with Fry carrying the emotional weight of his decision, Leela providing support, and Bender offering his usual comedic relief, albeit with a hint of sincerity in the moment.

In the episode "The Deep South" of Futurama, there is no post-credit scene. The episode concludes without any additional scenes or content after the credits roll. The story wraps up with Fry, Leela, and Bender having experienced their adventure in the underwater city of Atlanta, where they encounter various sea creatures and ultimately find Fry's lost pet, Seymour. The episode ends on a note that reflects the themes of friendship and the bond between Fry and Seymour, but there are no further scenes or jokes after the credits.

Bender, while searching for the lost city of Atlanta, ends up in the underwater city of Atlanta, where he is treated as a celebrity due to his metallic nature. The inhabitants, who are fish-like creatures, are fascinated by him and he enjoys the attention, reveling in the idea of being a 'big fish' in their world.

Fry is initially excited about the discovery of the underwater city and the fish people, but his excitement turns to horror when he learns that the fish people are actually the descendants of humans who were transformed into fish due to pollution. This revelation causes Fry to feel a mix of sympathy and sadness for their plight.

Leela plays a crucial role as she is the one who leads the crew to search for the lost city of Atlanta after they find a map. Her determination and leadership are evident as she navigates the challenges they face, and she also expresses concern for Fry's safety when he gets too involved with the fish people.

The Professor provides the crew with the historical context of Atlanta and its transformation into an underwater city. His knowledge is pivotal in understanding the backstory of the fish people and the environmental issues that led to their current state, showcasing his role as the team's intellectual guide.

Bender's brash and self-centered personality shines through in his interactions with the fish people. He often prioritizes his own desires for fame and admiration over the well-being of others, which leads to humorous yet morally questionable situations, highlighting his character's flaws and comedic nature.

"The Deep South" episode of Futurama contains several elements that may be considered objectionable or upsetting for children or sensitive viewers. Here are some aspects to consider:

1. Mild Violence: There are scenes that depict characters in perilous situations, including moments of physical danger and threats from creatures.

2. Dark Humor: The episode employs dark humor, which may not be suitable for younger audiences. This includes jokes that touch on themes of death and existentialism.

3. Animal Treatment: The episode features anthropomorphic fish and other sea creatures, and there are moments that could be interpreted as unsettling regarding their treatment.

4. Mature Themes: There are underlying themes related to identity and belonging that may be complex for younger viewers to fully grasp.

5. Innuendo: Some jokes and dialogue contain innuendo that may not be appropriate for children.

Overall, while "The Deep South" is a comedic episode, its humor and themes may not align with family-friendly standards for all viewers.