Travis Bickle, portrayed by Robert De Niro, is a troubled young man navigating the lonely streets of New York City. Seeking a job, he lands a position as a taxi driver, guided by a tough personnel officer. An honorably discharged Vietnam veteran, Travis struggles with chronic insomnia, forcing him to work the night shift. Living a reclusive life at 26, he fabricates stories about his existence in letters to his parents, mingling fantasy with reality as he claims to work with the Secret Service.

His days are filled with solitude, whether spent in his dilapidated Manhattan apartment or in dingy adult movie theaters. In one of these theaters, he awkwardly tries to connect with a concession lady but fails. As he drives his taxi for long hours, he often retreats to a 24-hour diner where he interacts with fellow cab drivers, including the self-proclaimed philosopher named Wizard.

During his shifts, Travis becomes entranced by Betsy, a campaign volunteer for Senator Charles Palantine, who is vying for the presidential nomination with promises of significant social reform. Despite witnessing her camaraderie with co-worker Tom, Travis gathers the courage to ask Betsy out, resulting in an initially promising date where they share coffee and connect over their mutual feelings of loneliness.

However, Travis’s disdain for the societal decay around him deepens. One fateful night, he picks up a young prostitute named Iris, attempting to escape from her pimp, Sport. Unable to act swiftly, Travis watches in horror as Sport rescues Iris, bribing him to stay silent.

In an alarming interaction with Senator Palantine, Travis expresses his discontent, stating his desire for a leader who can “clean the scum off New York City.” Yet, their contrasting worlds further isolate him, culminating in a disastrous date with Betsy at a porn theater that leaves her horrified and ultimately leads to her rejection.

Haunted by this rejection, Travis spirals into despair, encountering a mentally unstable passenger who shares dark plans of vengeance. He seeks solace at the diner by venting his frustrations to Wizard, only to receive a dismissive reply. This exchange propels Travis’s descent into violence. Troubled by the rampant crime he witnesses, he turns to an illicit dealer, acquiring a small arsenal of weapons.

His obsession grows as he becomes fixated on Senator Palantine and contemplates drastic actions regarding Betsy. Practicing an unsettling speech to himself, Travis embraces a dark transformation that further alienates him from society. His descent into madness culminates when he inadvertently interrupts a grocery store robbery, shooting the thief in a burst of violence while receiving encouragement from the grocery owner.

Travis eventually confronts Iris, trying to rescue her from her circumstances. During their conversation, her connection with Sport complicates matters, emphasizing the struggle between innocence and corruption. As he contemplates saving her, Travis’s mental state deteriorates into dangerous territory. Shortly thereafter, he boldly attends a rally for Senator Palantine, armed and ready for an act of violence.

On the brink of chaos, Travis storms into Sport’s territory, resulting in a brutal shootout that leaves several dead. He faces intense battles against muscle-bound enforcers but emerges as the last man standing, filled with a volatile mix of rage and despair. In a chilling moment of vulnerability, he attempts to take his own life, revealing his internal collapse, yet fate intervenes.

Through a mix of shocking violence and dark revelations, Travis’s actions lead him to be viewed as a hero to the media after saving Iris. Although he returns to work in his taxi, the trauma lingers, and his unsettling nature persists as he shares a brief ride with Betsy. The interaction ends ambiguously, leaving viewers questioning the stability of Travis’s mind and the haunting shadows of his turbulent journey. The final moments encapsulate the haunting duality of heroism and madness, as he adjusts his rearview mirror, hinting at the chaos that may yet return.