The episode "Praxeus" begins with a scene on a beach in Madagascar, where a man named Adam is seen struggling in the water. He is suddenly attacked by a strange creature, and moments later, he is found dead on the shore. The scene shifts to the TARDIS, where the Doctor, Yaz, Ryan, and Graham are discussing their next adventure. The Doctor receives a distress signal from Earth, prompting them to investigate.

The TARDIS lands in Madagascar, where the team discovers Adam's body. They are approached by a local woman named Suki, who is visibly shaken and explains that Adam was a scientist studying the ocean. The Doctor examines the body and notices unusual signs of infection. She decides to investigate further, leading the group to a nearby research facility.

At the research facility, the Doctor and her companions meet a group of scientists, including a man named Jake, who is working with Suki. They learn that there have been several similar deaths linked to a mysterious pathogen. The Doctor realizes that the pathogen is connected to a larger problem involving plastic waste in the ocean. She deduces that the creature that attacked Adam is a result of the pollution.

Meanwhile, the narrative shifts to a different location, where a pilot named Gabriela is flying her plane over the ocean. She receives a distress call from a nearby ship and attempts to assist. However, her plane is suddenly struck by a strange energy, causing her to crash land on a remote island. Gabriela survives the crash but is soon confronted by the same creature that attacked Adam.

Back at the research facility, the Doctor and her team analyze samples and discover that the pathogen is a form of alien life called Praxeus, which feeds on plastic and is causing the deaths. The Doctor realizes they need to find a way to stop the Praxeus before it spreads further. She sends Ryan and Yaz to search for Gabriela, while she and Graham stay behind to gather more information.

Ryan and Yaz locate Gabriela on the island, where she is recovering from her crash. They explain the situation and bring her back to the research facility. The group discusses their next steps, and the Doctor formulates a plan to confront the Praxeus creature. They decide to use a tracking device to locate the source of the pathogen.

As they prepare to execute their plan, the Doctor receives a message from Jake, who has been investigating the ocean. He reveals that he has found a massive underwater structure that appears to be the source of the Praxeus outbreak. The Doctor leads the team to the location, where they discover a hidden alien base.

Inside the base, they encounter the Praxeus creature, which is revealed to be a sentient being trying to survive in a polluted environment. The Doctor attempts to communicate with it, but the creature is aggressive and attacks. A confrontation ensues, with the team working together to fend off the creature while trying to find a way to neutralize the threat.

During the battle, Graham is injured, and the team must make a quick decision to save him while also dealing with the creature. The Doctor realizes that the only way to stop the Praxeus is to destroy the base, which will also eliminate the creature. She makes the difficult choice to initiate a self-destruct sequence in the base.

As the countdown begins, the team races to escape. They manage to get out just in time, and the base explodes, taking the Praxeus with it. The Doctor reflects on the impact of pollution and the importance of protecting the environment. The team returns to the TARDIS, where they share a moment of camaraderie, having faced the threat together.

The episode concludes with the Doctor and her companions preparing for their next adventure, leaving behind the lessons learned from their encounter with Praxeus.

In the ending of "Praxeus," the Doctor and her friends successfully stop the Praxeus virus from spreading. They discover that the source of the virus is a satellite that has been contaminated by microplastics. The Doctor uses her sonic screwdriver to disable the satellite, preventing further contamination. The team manages to save the remaining infected individuals, including a young man named Adam, who is saved just in time. The episode concludes with the Doctor reflecting on the importance of caring for the planet and the consequences of human actions.

As the episode nears its conclusion, the Doctor, Yaz, Ryan, and Graham gather in a remote area of Madagascar, where they have tracked the source of the Praxeus virus. The atmosphere is tense, filled with urgency as they race against time to prevent further spread of the deadly infection. The Doctor, with her characteristic determination, leads the group, her mind racing with solutions as they piece together the clues they have gathered throughout their journey.

They discover that the Praxeus virus is linked to a satellite that has been contaminated with microplastics, which are causing the virus to spread. The Doctor's eyes narrow with focus as she realizes the gravity of the situation. She instructs her friends to help her devise a plan to disable the satellite. The urgency of their mission is palpable, and the stakes are high as they know that lives are at risk.

In a series of quick, decisive actions, the Doctor uses her sonic screwdriver to interface with the satellite. The tension builds as she works against the clock, her brow furrowed in concentration. The team watches anxiously, knowing that the fate of many hangs in the balance. As the Doctor successfully disables the satellite, a wave of relief washes over the group. They have managed to stop the virus from spreading further, but the emotional weight of the situation lingers.

Meanwhile, Adam, a young man who had been infected, is on the brink of death. The Doctor and her friends rush to his side, and with a combination of medical knowledge and the resources they have, they manage to save him just in time. The moment is filled with emotion as Adam, once on the verge of losing everything, is given a second chance at life. The Doctor's compassion shines through as she reassures him, emphasizing the importance of hope and resilience.

As the episode wraps up, the Doctor gathers her friends for a moment of reflection. They stand together, looking out over the beautiful landscape of Madagascar, a stark contrast to the chaos they just faced. The Doctor speaks about the importance of caring for the planet and the consequences of human actions, reminding them that their choices have far-reaching effects. The group shares a moment of camaraderie, united by their experiences and the bonds they have formed.

In the final scenes, the Doctor and her friends prepare to leave Madagascar, their hearts heavy yet hopeful. They have faced danger and uncertainty, but they have emerged stronger and more connected. The episode closes with the Doctor's words echoing in the air, a reminder of the ongoing battle to protect the Earth and the responsibility that comes with it. Each character leaves with a renewed sense of purpose, ready to face whatever challenges lie ahead.

In "Praxeus," there is no post-credit scene. The episode concludes without any additional scenes or content after the credits roll. The story wraps up with the Doctor and her companions reflecting on their experiences and the events that transpired during their encounter with the Praxeus virus, but there are no further revelations or cliffhangers presented in a post-credit format.

The Praxeus virus is a central plot element that causes a series of mysterious deaths across the globe. It is revealed to be a result of microplastics that have been contaminated by an alien organism, which leads to a deadly infection. The virus serves as a metaphor for environmental issues and the consequences of pollution, driving the urgency of the Doctor and her companions to find a solution.

The Doctor, along with Yaz, Ryan, and Graham, begins their investigation in Madagascar after a man is found dead with unusual symptoms. They soon discover that the same symptoms are appearing in other locations, including the UK and a space station. By piecing together clues from the victims and their environments, they uncover the link to the Praxeus virus and its origins.

Adam is a scientist working on the space station who becomes crucial to the plot. He is initially portrayed as a dedicated researcher, but as the story unfolds, it is revealed that he has been experimenting with the Praxeus virus, leading to dire consequences. His character arc explores themes of ambition and the ethical implications of scientific discovery.

The episode features characters like the environmental activist, who is deeply concerned about the impact of pollution on marine life. This character's passion for protecting the planet resonates with the Doctor and her companions, highlighting their motivations to combat the Praxeus virus and its environmental implications. The emotional stakes are raised as they confront the consequences of human actions on the Earth.

The environmental activist, who initially appears to be a strong advocate for change, faces a tragic fate when she becomes infected by the Praxeus virus. Her death serves as a poignant reminder of the stakes involved in the fight against environmental destruction. This loss deeply affects the Doctor and her companions, reinforcing their determination to stop the virus and save others from a similar fate.

"Doctor Who" Season 12, Episode 6, titled "Praxeus," contains several elements that may be considered objectionable or upsetting for children or sensitive viewers. Here are some aspects to be aware of:

1. Body Horror: The episode features scenes involving a deadly alien pathogen that affects humans, leading to visual representations of sickness and decay, which may be unsettling.

2. Death and Danger: Characters face life-threatening situations, and there are moments of peril that could be frightening for younger viewers.

3. Environmental Themes: The episode addresses serious themes related to pollution and its impact on wildlife, which may evoke concern or anxiety about environmental issues.

4. Emotional Moments: There are scenes that explore loss and grief, which could be emotionally intense for some viewers.

5. Tension and Suspense: The pacing includes suspenseful moments that may create anxiety, particularly in scenes where characters are in danger.

These elements contribute to the overall tone of the episode, which balances adventure with darker themes, making it potentially more suitable for older children and adults.