The episode begins with a flashback to the events of the first movie, where Mewtwo, a genetically engineered Pokémon, is seen escaping from the laboratory where it was created. Mewtwo reflects on its existence and the purpose of its creation, feeling a deep sense of isolation and anger towards humanity. The scene transitions to the present day, where Mewtwo has established a hidden sanctuary for itself and other Pokémon, away from human interference.

Ash, Misty, and Brock are introduced as they travel through a forest. They are discussing their recent adventures when they encounter a group of Team Rocket members--Jessie, James, and Meowth--who are plotting to capture Mewtwo. Team Rocket believes that capturing Mewtwo will grant them immense power and wealth. They set off to find Mewtwo's location, unaware of the dangers that lie ahead.

Meanwhile, Mewtwo is shown in its sanctuary, surrounded by various Pokémon. It is protective of its home and the Pokémon living there. Mewtwo senses the presence of Team Rocket and becomes agitated, realizing that they pose a threat to its sanctuary. Mewtwo's internal conflict is evident as it grapples with its desire for peace and the need to defend its home.

As Team Rocket approaches the sanctuary, they deploy a series of traps and gadgets designed to capture Mewtwo. They manage to infiltrate the area, but Mewtwo quickly detects their presence. In a dramatic confrontation, Mewtwo uses its psychic powers to repel Team Rocket's initial attempts to capture it. The scene is filled with intense visuals as Mewtwo showcases its abilities, creating barriers and launching psychic blasts.

Ash and his friends arrive at the sanctuary just in time to witness the chaos. They see Mewtwo defending itself against Team Rocket and realize they must intervene. Ash, motivated by his desire to protect Pokémon, steps forward and calls out to Mewtwo, trying to reason with it. He expresses understanding of Mewtwo's pain and loneliness, hoping to connect with the powerful Pokémon.

Mewtwo, initially distrustful, hesitates but ultimately listens to Ash. The emotional weight of the moment is palpable as Ash shares his own experiences with Pokémon and the bonds they share. This moment of vulnerability allows Mewtwo to lower its defenses slightly, creating a brief truce between them.

However, Team Rocket is not deterred. They regroup and launch a more aggressive attack, using advanced technology to try and subdue Mewtwo. In a tense sequence, they unleash a powerful energy beam aimed at Mewtwo, which it narrowly avoids. The sanctuary begins to crumble under the strain of the battle, and the Pokémon within it are put at risk.

In a pivotal moment, Ash and his friends join forces with Mewtwo to fend off Team Rocket. They coordinate their Pokémon to create a united front. Pikachu, Charizard, and other Pokémon engage in battle against Team Rocket's machines. The action is fast-paced, with each character showcasing their unique abilities and strategies.

As the battle intensifies, Mewtwo realizes that it cannot fight alone. It taps into its psychic powers to amplify the strength of Ash's Pokémon, creating a powerful synergy. This collaboration leads to a stunning visual display of energy as Mewtwo and Ash's Pokémon launch a combined attack against Team Rocket.

The climax of the battle sees Team Rocket's machines overwhelmed by the combined might of Mewtwo and Ash's Pokémon. In a final desperate attempt, Team Rocket tries to escape with a captured Pokémon, but Mewtwo intervenes, using its powers to free the Pokémon and send Team Rocket blasting off again.

With Team Rocket defeated, the sanctuary is left in ruins, but Mewtwo feels a sense of relief and gratitude towards Ash and his friends. Mewtwo acknowledges the importance of companionship and the bonds that can exist between humans and Pokémon. The emotional resolution is highlighted as Mewtwo expresses a desire to protect its sanctuary and the Pokémon within it, but also recognizes the value of friendship.

The episode concludes with Ash, Misty, and Brock bidding farewell to Mewtwo. They leave with a newfound understanding of the complexities of Pokémon emotions and the importance of coexistence. Mewtwo watches them leave, contemplating its place in the world, and the screen fades to black, marking the end of the episode.

In the ending of "Mewtwo Returns," Ash and his friends confront Mewtwo, who is struggling with his identity and purpose. After a fierce battle, Mewtwo ultimately decides to protect the world rather than destroy it. He uses his powers to erase the memories of the battle from everyone involved, including Ash and his friends, and then departs to find a place where he can exist peacefully. The episode concludes with Ash and his friends unaware of the events that transpired, but with a sense of hope for the future.

As the climax of "Mewtwo Returns" unfolds, the scene is set in a remote, desolate area where Mewtwo has established his base. The atmosphere is tense, filled with the weight of unresolved conflict and the emotional turmoil of the characters involved. Ash, Misty, and Brock arrive, determined to confront Mewtwo, who has been misunderstood and feared due to his immense power.

The first scene of the ending begins with Ash standing resolutely, his determination evident in his eyes. He calls out to Mewtwo, expressing his belief that they can find a way to coexist peacefully. Mewtwo, however, is conflicted, grappling with his identity as a clone and the purpose of his existence. His internal struggle is palpable, and the audience can sense his pain and anger as he questions the nature of humanity and his own being.

As the confrontation escalates, Mewtwo unleashes his psychic powers, creating a whirlwind of energy that sends Ash and his friends flying. The battle is intense, showcasing the strength of Mewtwo's abilities as he defends himself against Ash's Pokémon. Pikachu, loyal and brave, stands by Ash's side, ready to fight for their friendship and the chance to reach Mewtwo.

In a pivotal moment, Ash reaches out to Mewtwo, not with anger but with compassion. He shares his own experiences of feeling lost and misunderstood, hoping to connect with Mewtwo on a deeper level. This moment of vulnerability resonates with Mewtwo, who begins to lower his defenses. The battle pauses, and the tension shifts as Mewtwo contemplates Ash's words.

The scene transitions to a moment of clarity for Mewtwo. He realizes that his purpose does not have to be one of destruction. Instead, he can choose to protect the world and those who inhabit it. This revelation is visually represented as a soft glow surrounds Mewtwo, symbolizing his acceptance of a new path. The emotional weight of this decision is heavy, as Mewtwo understands the implications of his choice.

In the final moments, Mewtwo uses his powers to erase the memories of the battle from Ash, Misty, Brock, and Team Rocket, who have also been caught up in the chaos. This act is both a sacrifice and a gift, allowing them to return to their lives without the burden of the conflict they experienced. The scene is poignant, filled with a sense of loss and hope as Mewtwo bids farewell to Ash and his friends, disappearing into the horizon.

As the episode concludes, Ash and his friends are left with a sense of normalcy, unaware of the profound encounter they just had. They continue their journey, filled with optimism for the future, while Mewtwo embarks on a solitary path, seeking peace and understanding in a world that has often rejected him.

In summary, Ash, Misty, and Brock return to their lives, their memories wiped clean, while Mewtwo finds a new purpose in protecting the world. The episode closes on a hopeful note, emphasizing themes of identity, acceptance, and the power of compassion.

In the episode "Mewtwo Returns," there is no post-credit scene. The episode concludes with the resolution of the main plot, focusing on Mewtwo's journey and the emotional connections formed throughout the story. After the climactic battle and the resolution of the conflict with Team Rocket, the episode wraps up without any additional scenes or teasers following the credits. The focus remains on the themes of identity, friendship, and the struggle for acceptance, leaving viewers with a sense of closure regarding Mewtwo's character arc.

Mewtwo returns driven by a desire to understand its own existence and the purpose of its creation. It grapples with feelings of isolation and seeks to find a place in the world, leading to its confrontation with humans and other Pokémon.

Ash, Misty, and Brock are initially shocked and concerned upon learning of Mewtwo's return. They feel a mix of empathy and fear, recalling their previous encounters with Mewtwo, and are determined to help it find peace.

Giovanni, the leader of Team Rocket, seeks to control Mewtwo for his own gain, attempting to exploit its powers. His manipulative nature and desire for dominance create a significant conflict, as Mewtwo must confront its past and Giovanni's intentions.

Mewtwo's relationship with the cloned Pokémon deepens as it realizes they share a common struggle for identity and acceptance. Mewtwo becomes protective of them, showcasing its growth from a vengeful being to a more compassionate figure.

The battle serves as a pivotal moment for Mewtwo, illustrating its internal conflict between its powers and the desire for peace. It highlights the themes of friendship and understanding, as the other Pokémon challenge Mewtwo's perception of strength and purpose.

"Mewtwo Returns" is generally considered family-friendly, but there are a few scenes and themes that might be potentially objectionable or upsetting for children or sensitive viewers:

1. Existential Themes: The episode explores deep themes of identity, purpose, and the nature of existence, particularly through Mewtwo's struggles with its own creation and purpose, which may be complex for younger viewers to fully grasp.

2. Conflict and Violence: There are scenes of conflict, including battles between Pokémon and human characters, which may be intense for some children. The stakes are high, and the emotional tension can be palpable.

3. Emotional Distress: Characters experience feelings of sadness, loneliness, and betrayal, particularly Mewtwo, which may resonate deeply and evoke empathy but could also be upsetting for sensitive viewers.

4. Mewtwo's Isolation: Mewtwo's feelings of isolation and its desire for acceptance can be poignant and may touch on themes of loneliness that some children might find distressing.

5. Threats to Safety: There are moments where characters face danger, and the sense of urgency and peril can create a tense atmosphere.

While these elements are handled within the context of a children's show, they may still provoke strong emotional reactions in some viewers.