The fourth season of the Pet Simulator animated television series, which contains the "The Axolotl Ocean" storyline, was produced by Picscreen Film Productions and Thunder Entertainment and directed by Reagan Huff and Peter Lee (until episode 100). Like the rest of the series, it follows the adventures of Molly Melendez and his pet Axolotl, along with another group of people, set out to find the "Dog Club," an extremely rare and expensive treasure at the end of their world, also known as the "Dog World". It deals with Molly discovering the origins of her pet Axolotl and meet the creature's parents and family as she learns about the truth of how "eggs" worked in the world. This was the final season to contain the Pet Simulator title as starting with the fifth season, for the Pixel World storyline, the series was retitled for the following four seasons to Pet Simulator X.

The season initially ran from February 9, to October 18, 2020 on Avast Television in the United States; twelve DVD compilations (each containing two episodes) was released between August 8, 2020 and February 27, 2021. On April 12, 2020, following the broadcast of the tenth episode, Avast Television confirmed that the series was going on a hiatus due to the COVID-19 pandemic, delaying the next episode from its original April 19 date. The series returned to the network on July 5 of that year. Robloxian Educational Television licensed for a Spanish-language dub for release on their network of the same title in the United States and internationally, with Avast Television streaming the dub on their Spanish website. Robloxian Educational Television's adaptation of this season aired from July 3 through December 25, 2020; three DVD compilations of the Spanish version were released between October 8, 2020 and January 28, 2021.

The season uses four piece of theme music: two opening themes and two ending themes. The opening themes are "Sealand Sounds" by Alexander Stone for the first 13 episodes and "olden new world" by Desiree Woods for the remainder of the season. The ending theme is "out of horizon" by Rodrigo Benson for the first 13 episodes and "Dance Autumn" by Callum Mills for the rest of the season.

Episodes

Main article: List of Pet Simulator episodes
No. overall No. in season Title Directed by Original air date International air date
Axolotl Ocean
79 1 "Entering the World of the Axolotl Ocean" James Mccarthy February 9, 2020 July 3, 2020
Molly, Jairo, and Cortez found themselves in the heart of the vast ocean when, out of the blue, a mysterious force tugged at the water, dragging their ship beneath the waves with a deafening roar. As the vessel plummeted into the murky depths, a surge of disbelief gripped the trio, convinced that their lives were rapidly coming to an end. To their astonishment, however, they miraculously survived the ordeal. Awed by the enchanting realm they now found themselves in, they embarked on an adventurous journey, discovering the mesmerizing beauty of the underwater world that they later came to know as “The Axolotl Ocean.” Amidst the bewildering setting, Molly couldn't shake off the nagging suspicion that it was her beloved Axolotl that wielded such extraordinary power, though she chose to remain tight-lipped about the matter.
80 2 "Visit Molly's Axolotl's Family! The Reunion that Molly Never Expected" Freya Webb February 16, 2020 July 10, 2020
Molly's bond with her pet Axolotl grows stronger when it unexpectedly pulls her into the depths of the ocean, revealing a hidden past where it belonged to a family. The revelation leaves Molly stunned and questioning how her Axolotl had a family even before it was in the egg she had cared for weeks. In an effort to unravel this mystery, Molly and Cortez delve into research on the subject, while Jairo is tasked with investigating the background of the Axolotl's family to gain deeper insights into their connection with the enigmatic creature.
81 3 "Through the Ocean Floor" Nathan Hull February 23, 2020 July 17, 2020
After witnessing the surprising sight of the Axolotls having personalized homes and shops on the ocean floor, Molly, Cortez, and Jairo were intrigued and eager to delve deeper into understanding these unique creatures. The group was taken aback by the existence of such intricate establishments in the underwater world. Fueled by curiosity, Molly and her companions decided to prioritize exploring these shops first to gain insights into the lives of the Axolotls before embarking on any further investigations. They felt a sense of urgency to grasp the significance of these unique underwater dwellings before delving into a comprehensive study of the Axolotls themselves.
82 4 "Meet the Houses that Are In the Water! The Intense Breathing Problem" Zion Foreman March 1, 2020 July 24, 2020
After Molly, Cortez, and Jairo made the decision to explore the homes previously inhabited by the Axolotl, they were astounded to discover that these dwellings were intricately crafted from sticks and wood sourced from the depths of the ocean floor. Delving deeper into the research, Molly found herself in awe of the resourcefulness displayed in the construction of these unique homes, pondering the techniques and skills involved in their creation. In the meantime, Cortez and Jairo noticed that one of the homes appeared perilously close to succumbing to the relentless force of the water, prompting them to spring into action. Determined to fortify the weakened structure, they embarked on a quest to procure fresh materials, venturing out on a mission to salvage suitable woods to reinforce the vulnerable house.
83 5 "Molly, Cortez and Jairo's Moment of Shining" Nathan Hull March 8, 2020 July 31, 2020
In an unexpected turn of events, Molly, Cortez, and Jairo found themselves being honored with a grand parade organized by the Axolotl, leaving them utterly astonished. Despite their larger size compared to the Axolotl, the trio wholeheartedly embraced the joyous and vibrant celebration, immersing themselves in the festive atmosphere. The parade, filled with colorful decorations, cheerful music, and exuberant dancing, created unforgettable memories for Molly, Cortez, and Jairo. Surrounded by the warm and welcoming community of the Axolotl, they basked in the appreciation and friendship showered upon them, savoring every moment of the lively procession.
84 6 "Hope for the Axolotl - Molly's Goodbye to her Axolotl" Alisha Orr March 15, 2020 August 7, 2020
As Molly observes her pet Axolotl joyfully engaged in playful interactions and conversations with the others in the vicinity, a deep sense of melancholy washes over her. The realization that her beloved Axolotl may have found new companionship stirs a feeling of longing in Molly, fueling her belief that perhaps her pet no longer sees her as its primary caretaker. After contemplative discussions with Cortez and Jairo, Molly finds herself overcome with emotion as she tenderly bids farewell to her cherished Axolotl, promising to return one day to reunite with the creature she has grown to love profoundly.
85 7 "Can't Look Back! The Decision that Molly Don't Like" Amelie Atkinson March 22, 2020 August 14, 2020
Molly's heart ached with sorrow at having to part ways with her beloved pet. Upon their return to the ship, Cortez and Jairo noticed her distress and decided to lift her spirits. Despite their efforts, Molly remained despondent and distanced herself from them. Understanding her pain, Cortez gently guided her down memory lane, reminiscing about the cherished moments she shared with her pet. Overwhelmed by a bittersweet wave of emotions, Molly wrapped Cortez in a tearful embrace, finding solace in his comforting presence.
86 8 "I Feel the Pain between the Two" Lara Sharp March 29, 2020 August 21, 2020
Following the events of the last episode, Molly and Cortez agreed that they needed to support each other. However, early on, Molly begins to feel melancholy, recalling the moment when the two had broken out and opted not to hang out with Cortez, who returns to the Axolotl's houses to greet her, during which the pet is confirmed as a female. The two then chose to regroup and exchange an intense hug, relieved that they had finally met and pledged to never abandon each other after what had happened.
87 9 "My Little One, Where Are You Going! The Heated Battle for the Two's Reunion" James Mccarthy April 5, 2020 August 28, 2020
While Cortez and Jairo expected everything to go smoothly, Molly and her Axolotl are not doing so well, and the two are trying to figure out what occurred between them to make them this way. So Cortez and Jairo started to question the two about what had transpired, and the two chose to clarify what had actually happened. After seeing this, the two agreed to resolve the issue by sending this to each other, and they promised to be kinder to each other from now on. However, the ship suddenly sinks deeper into the ocean, causing the three to freak out once more.
Axolotl Deep Ocean
88 10 "Into the Deep, Deep Ocean! Molly's Great Adventures" Lara Sharp April 12, 2020 September 4, 2020
As Molly attempts to regain control of the ship, the water makes it hard for them to maneuver, and it is only with the assistance of her Axolotl that the ship stops sinking further. However, the ship is now deep in the ocean, and in the meantime, Molly explores the water and encounters a variety of species and pets she had never seen before. However, just as the ship is about to turn around, a Shark attacks, putting Molly's life in danger, but her Axolotl saves the day, and the two's connection grows deeper. However, they are unaware that they are going to enter a massive undersea battle between Sharks and other monsters.
89 11 "The Battle That Take Place Underwater! The Creatures Get Hurt" Elliot Green July 5, 2020 September 11, 2020
While the gang was resting, the ship began to shake severely, followed by a massive explosion that sent the ship flying everywhere toward the fight scene. Molly and the group notice the battle and attempt to intervene, but a shark is flung into the walls, breaking the water to enter. Molly and the others decided to try to fix the large hole in the middle, but they were unable to do so. Meanwhile, as the conflict worsened, Molly and the group's pet decided to join in, and as the combat was on the verge of death, Molly's Axolotl forced the ship to leave. Following that, a massive explosion flips the ship upside down, and smoke blankets the air.
90 12 "Save the Creatures before their Death" Lewis Shaw July 12, 2020 September 18, 2020
Upon witnessing the devastating aftermath of the explosion, Molly and her companions notice that numerous Axolotls and other creatures lay injured. Acting swiftly and decisively, they rely on the assistance of Molly's trusted Axolotl to transport the wounded beings to safety on land. While the injured are carefully delivered to a place of refuge, Molly and the group prepare to make their way back down to the scene to offer further aid and assess the situation for any remaining survivors.
91 13 "Get to Meet the King and the Queen" Lara Sharp July 19, 2020 September 25, 2020
Molly, Cortez, and Jairo gathered together, their excitement palpable as they were informed about the rare opportunity to meet the renowned Axolotl monarchs for the very first time. Eagerly accepting the invitation, they arrived at the grand meeting place amidst a delightful ambiance, engaging in lively conversations and forming new connections with their amphibious hosts. Molly's own Axolotl companion observed the gathering with a mix of pride and delight, basking in the joy of seeing its human friends interact harmoniously with the royal Axolotl couple.
Axolotl shorts
92 14 "Axolotl - First Episode" Amelie Atkinson July 26, 2020 October 2. 2020
Set before the unfolding of the first season, a mischievous bunch of Axolotl embarked on a series of playful pranks against one another. These antics eventually escalated into a heated dispute, with tempers flaring as they debated the merits and execution of each prank. The tension within the group mounted, culminating in a clash that revealed underlying tensions and dynamics among the Axolotl. As their disagreements intensified, the once-harmonious atmosphere turned fraught with discord, highlighting the complexities of their relationships and the consequences of their lighthearted mischief.
93 15 "Axolotl - Second Episode" Nathan Hull August 2, 2020 October 9, 2020
In certain circumstances, due to their natural habitat being threatened due to a lack of food, axolotls have had to adapt by venturing onto land to seek out human-made food items, carefully selected and provided by individuals to meet the unique dietary needs of these delightful amphibians. These snacks are then carried down to the depths where the axolotls reside, ensuring that they can partake in and savor these specially prepared meals, thereby ensuring their well-being and sustenance amid changing environmental conditions and challenges.
94 16 "Axolotl - Third Episode" Lara Sharp August 9, 2020 October 16, 2020
In this episode, it dives into a fascinating journey that delves into the intricate details surrounding the birth and establishment of the Axolotls' habitat, providing valuable context to their current living situation preluding the unfolding events of the first season. Exploring the origins of the Axolotls' place offers a deeper understanding of the environment that shapes their existence, shedding light on the factors that have influenced their behavior and interactions within their surroundings.
95 17 "Axolotl - Fourth Episode" Lewis Shaw August 16, 2020 October 23, 2020
After a huge fight breaks out among the Axolotls, they engage in playful interactions with each other, helping to mend their relationships and learn valuable lessons in friendship. Through these interactions, the Axolotls demonstrate a remarkable ability to form bonds and exhibit cooperative behavior, highlighting their unique social dynamics within their community. Despite initial conflicts, the Axolotls utilize play as a tool to rebuild trust and establish camaraderie among themselves, fostering a sense of unity and mutual respect within the group.
Axolotl Deep Ocean (conti.)
96 18 "Explain the Past of the Ocean! We Discover the Legend" Lara Sharp August 23, 2020 October 30, 2020
Molly and her curious Axolotls found themselves feeling restless and seeking adventure. It was on a fateful day when they decided to embark on a journey to uncover the mythical legends surrounding the original king of the ship who had supposedly met his demise at the jaws of a fearsome Shark. To everyone's amazement, they discovered that the legendary leader was still alive, albeit aged. This astonishing revelation sent waves through the entire community, leaving Molly bewildered by the varied reactions of those around her.
97 19 "Molly and Her Axolotl" Lara Sharp August 30, 2020 November 6, 2020
In this special episode, viewers are treated to a comprehensive recap of the first 96 episodes of the beloved television series, Pet Simulator. The spotlight is on the endearing bond shared between Molly, the protagonist, and her loyal companion, the Axolotl. Through nostalgic flashbacks and heartwarming moments, the episode delves deep into the pivotal moments that have shaped their extraordinary friendship, captivating audiences with a journey down memory lane.
The Origins of the Axolotl
98 20 "The Past of Molly's Axolotl" Nathan Hull, Lara Sharp, Ameli Atkinson, James Mccarthy, Zion Foreman September 6, 2020 November 13, 2020
99 21 September 13, 2020 November 20, 2020
100 22 September 20, 2020 November 27, 2020
Part 1: Prior to becoming Molly's beloved pet, the Axolotl had initially lived a carefree life, born through the union of two loving parents. In their serene hometown, the Axolotl enjoyed tranquility until a fateful day when a group of menacing Sharks disrupted the peace. In the chaos that ensued, the Axolotl became separated and embarked on a journey to find her way back home. However, her fate took a twist when she encountered a group of humans who unknowingly whisked her away from the only place she had ever known.
Part 2: After being taken by the humans, the Axolotl is carefully examined by the scientists who are preparing to place it in an egg where it will undergo a process of re-development, erasing its memories of the past events. Intriguingly, the Axolotl manages to escape and embarks on a thrilling chase throughout the entire building, creating chaos along the way. After a suspenseful pursuit, it is eventually captured and safely enclosed within the egg, where its journey of transformation continues.
Part 3: The Axolotl gracefully swims its way into the hearts of many parents and children, although some initially dislike it and are hesitant to accept its presence. Eventually, it gains exposure during a school event, where it crosses paths with Molly for the very first time, marking a significant moment that subsequently sparks a special connection between them from the beginning of the first episode.
101 23 "The Emotional Connection between the Two! The Legend is Finally Told" Lara Sharp September 27, 2020 December 4, 2020
102 24 "Into the Land, We Go" James Mccarthy October 4, 2020 December 11, 2020
103 25 "The Moment that She Had Been Waiting For" Lara Sharp October 11, 2020 December 18, 2020
104 26 "Head to Pixel World! A New Era of Our Adventure Starts" Elliot Green October 18, 2020 December 25, 2020

Home media releases

English

In the United States, Avast Entertainment released the entirely of the fourth season on twelve DVD compilations, titled as "Season Four – The Axolotl Ocean", each containing a total of two episodes, outside from the final volume, which featured a total of four episodes.

Avast Entertainment (United States - Region 1)
Volume Episodes Release date
Season Four – The Axolotl Ocean Volume 1 79–80 August 8, 2020
Volume 2 81–82 August 22, 2020
Volume 3 83–84 September 9, 2020
Volume 4 85–86 September 24, 2020
Volume 5 87–88 October 6, 2020
Volume 6 89–90 October 20, 2020
Volume 7 91–92 November 2, 2020
Volume 8 93–94 November 19, 2020
Volume 9 95–96 December 4, 2020
Volume 10 97–98 December 29, 2020
Volume 11 99–100 January 24, 2021
Volume 12 101–104 February 27, 2021

Spanish

Robloxian Educational Television (Bloxico - Region 2)
Volume Episodes Release date
Simulador De Mascotas - El Mundo De Los Axolotl Volumen Uno 79–81 October 8, 2020
Volumen Dos 82–92 December 18, 2020
Volumen Tres 93–104 January 28, 2021