The episode begins with Fry, Bender, and Leela visiting a museum exhibit featuring the heads of U.S. presidents preserved in jars. Fry is particularly fascinated by the display, and he expresses a desire to learn more about the history of the presidents. As they explore, they come across a time machine that is being showcased as part of the exhibit. The time machine is designed to allow users to travel back in time to meet historical figures.

Fry, excited by the prospect, convinces Leela and Bender to use the time machine to visit the past. They set the machine to take them to the time of George Washington. Upon arrival, they find themselves in the midst of a Revolutionary War battle. Fry, dressed in a colonial outfit, is thrilled to meet Washington, but their presence disrupts the timeline. Washington mistakes Fry for a British soldier and orders him to be captured.

In the chaos, Fry, Leela, and Bender manage to escape and decide to travel to meet other presidents. They jump through time, visiting various historical periods and encountering presidents like Abraham Lincoln and Theodore Roosevelt. Each encounter is filled with humorous misunderstandings and anachronisms, as Fry and his friends struggle to fit in with the historical context.

As they continue their journey, they inadvertently alter key moments in history. For instance, Fry's interactions with Lincoln lead to a different outcome in the Civil War. The trio realizes that their meddling is causing significant changes to the timeline, and they must find a way to fix the damage they have done.

In a pivotal moment, they decide to return to the present and use the time machine to reverse their actions. However, they discover that the time machine has been damaged during their travels. They must now find a way to repair it while avoiding the attention of the historical figures they have encountered.

As they work on fixing the time machine, they are pursued by a group of time-traveling agents who are determined to capture them for their interference in history. A series of chase sequences ensues, with Fry, Leela, and Bender narrowly escaping capture multiple times. The tension builds as they realize that they are running out of time to restore the timeline before it collapses entirely.

In a climactic confrontation, they face off against the time agents in a battle that takes place across different historical settings. Each character uses their unique skills to outsmart the agents, with Bender employing his cunning and Fry relying on his luck. Leela takes charge, coordinating their efforts and ensuring they stay one step ahead of their pursuers.

Ultimately, they manage to repair the time machine just in time. They activate it and return to the present, where they find that history has been restored to its original state. However, they are left with the knowledge of their adventures and the humorous consequences of their actions.

The episode concludes with Fry reflecting on their journey and the importance of history, while Bender dismisses it as unimportant. The trio shares a laugh, highlighting their camaraderie and the absurdity of their experiences.

In the ending of "All the Presidents' Heads," Fry, Bender, and the Professor manage to return to the present after a series of time-traveling adventures involving the heads of U.S. presidents. They successfully prevent Richard Nixon's head from taking over the world. The episode concludes with the characters reflecting on their journey, and Fry ultimately decides to keep Nixon's head as a souvenir, despite the chaos it caused.

Now, let's delve into the ending in a more detailed narrative fashion:

As the climax of the episode unfolds, Fry, Bender, and Professor Farnsworth find themselves in a tense standoff with Richard Nixon's head, which has been manipulating events from the past to secure his power in the future. The trio has traveled through time, encountering various historical figures and navigating the complexities of time travel, all while trying to thwart Nixon's plans.

In a pivotal scene, they confront Nixon in a grand hall filled with the heads of other presidents, each one observing the chaos. Nixon, emboldened by his past successes, attempts to rally the other heads to his cause, promising them a return to power. Fry, feeling the weight of the responsibility on his shoulders, steps forward, determined to put an end to Nixon's tyranny. He recalls the lessons learned throughout their journey, emphasizing the importance of freedom and the dangers of unchecked power.

Bender, ever the wildcard, uses his unique abilities to create a distraction, allowing Fry and the Professor to devise a plan. They manage to outsmart Nixon, using a time paradox to trap him in a loop of his own making. As Nixon's head realizes he has been outmaneuvered, the tension in the room escalates. The other presidential heads, witnessing Nixon's downfall, begin to express their own opinions, leading to a humorous yet poignant moment where they reflect on their own legacies.

With Nixon defeated, Fry, Bender, and the Professor make their way back to the present. They arrive in the Planet Express headquarters, where the familiar sights and sounds of their everyday lives greet them. Fry, still holding Nixon's head, contemplates what to do with it. Despite the chaos it caused, he feels a strange attachment to the head, viewing it as a reminder of their adventure and the lessons learned about power and responsibility.

In the final moments, Fry decides to keep Nixon's head as a souvenir, placing it on a shelf among other mementos. Bender, ever the opportunist, suggests they could use it for a variety of schemes, but Fry insists on treating it with respect. The episode closes with a light-hearted banter among the characters, showcasing their camaraderie and resilience in the face of absurdity.

As the screen fades to black, the audience is left with a sense of closure for the characters. Fry has grown from his experiences, gaining a deeper understanding of history and the importance of standing up against tyranny. Bender remains his mischievous self, always looking for the next adventure, while the Professor continues to navigate the complexities of time travel with his usual eccentricity. The episode encapsulates the essence of "Futurama," blending humor with thoughtful commentary on history and character development.

In the episode "All the Presidents' Heads" from season 6 of Futurama, there is indeed a post-credit scene. After the main credits roll, the scene opens in a darkened room where a group of historical figures, including George Washington, Abraham Lincoln, and others, are gathered around a table. They are discussing the events that have transpired throughout the episode, particularly their experiences with Fry and the time travel escapades.

As they converse, the mood is light-hearted yet tinged with a sense of camaraderie among the presidents. They share jokes and anecdotes about their time in the past and their interactions with Fry, who had inadvertently caused chaos in their timelines. The scene captures the essence of their personalities, with Washington being stoic and Lincoln providing witty remarks.

The humor is characteristic of Futurama, blending historical references with absurdity. The scene concludes with a comedic twist, as one of the presidents suggests they should take a group photo, leading to a humorous moment where they all awkwardly pose, showcasing their distinct personalities and quirks. This post-credit scene serves as a playful nod to the episode's themes of history and time travel, leaving viewers with a light-hearted conclusion to the episode's events.

When Fry, Bender, and the Professor travel back in time to meet George Washington, they accidentally disrupt history by stealing Washington's head from Mount Rushmore. This act leads to a series of chaotic events as they attempt to return the head and fix the timeline.

After Bender becomes president, he adopts a more authoritative and self-serving personality. He revels in the power and luxury of the presidency, often making decisions that benefit himself rather than the public, showcasing his typical selfishness but amplified by his new position.

Richard Nixon's head plays a significant role as he becomes a key antagonist. He manipulates events from his position in the head museum, seeking to regain power and influence, ultimately leading to a confrontation with Bender and the others.

Fry and the gang attempt to fix the timeline by traveling back to various points in history to retrieve the stolen heads of other presidents. They face numerous challenges and comedic situations as they navigate through different historical events to restore the original timeline.

The time machine is significant as it serves as the catalyst for the entire plot. It allows Fry, Bender, and the Professor to travel through time, but its misuse leads to unintended consequences that they must rectify, highlighting the theme of responsibility in handling powerful technology.

"All the Presidents' Heads" from Futurama contains several elements that may be considered objectionable or upsetting for children or sensitive viewers. Here are some aspects to consider:

1. Violence and Death: The episode features scenes involving historical figures, including depictions of violence and death, which may be unsettling for younger audiences.

2. Dark Humor: The show often employs dark humor, including jokes about historical events and figures that may not be appropriate for all viewers.

3. Political Satire: The episode includes satire of political figures and events, which may be confusing or inappropriate for children who do not understand the context.

4. Mature Themes: There are themes related to power, betrayal, and the consequences of actions that may be too complex or heavy for younger viewers.

5. Innuendos: As with many episodes of Futurama, there are instances of innuendo and suggestive humor that may not be suitable for all ages.

These elements contribute to the show's overall tone, which often blends comedy with more serious themes, making it more suitable for older children and adults.