"Memento" (2000) follows Leonard Shelby, a man who can no longer form new memories, as he hunts the person he believes raped and killed his wife. Christopher Nolan tells the story in reverse chronological order, so each scene moves backward in time while a parallel black-and-white thread moves forward, and the ending reveals that Leonard has been manipulating himself for years.
The film's central trick is that Leonard's condition, anterograde amnesia, means he forgets everything that happens to him within minutes. He relies on Polaroid photos, handwritten notes, and tattoos covering his body to track facts, suspects, and instructions. By the final scenes, the film shows that the "facts" he trusts are not reliable, and that Leonard himself chose to keep hunting rather than face the truth.
Table of Contents
- What Happens in the Film's Timeline
- Who Killed Leonard's Wife, and What Teddy Reveals
- How the Ending Actually Unfolds
- What the Ending Means
- Key Terms and Details to Keep Straight
- Frequently Asked Questions
What Happens in the Film's Timeline
Leonard Shelby was an insurance investigator before an attack left his wife dead and his memory broken. He remembers his life before the attack clearly, but after it he cannot retain any new memory for more than a few minutes. He believes a man named "John G." committed the crime, and he has dedicated himself to finding and killing that man. Because the main story is told in reverse, each scene the audience sees happened before the one just shown.
A separate black-and-white sequence, shown in normal forward order, has Leonard narrating in a motel room and recounting an earlier case: Sammy Jankis, a man with the same memory condition whom Leonard investigated for an insurance claim. The two timelines converge at the film's end, which is actually the chronological middle of the story. Along the way, Leonard is helped and used by two people: Teddy (Joe Pantoliano), a police officer who has aided Leonard in killing previous men named John G., and Natalie (Carrie-Anne Moss), a bartender with her own agenda involving a drug dealer named Jimmy Grantz. Both manipulate Leonard's condition for their own ends, feeding him notes and information he has no way to verify.
Who Killed Leonard's Wife, and What Teddy Reveals
Near the film's climax, Teddy tells Leonard a version of events that overturns everything the audience has assumed. Teddy claims Leonard already killed the real attacker a year earlier, and that this John G. was someone Teddy himself helped Leonard track down and kill. Since then, Teddy has been steering Leonard toward other men named John G., including Jimmy Grantz, as a way to keep using him.
Teddy also reveals the truth about Sammy Jankis: Sammy did not have a wife, and the diabetic wife who died from an insulin overdose in that story was actually Leonard's own wife. Leonard's wife survived the original attack but was left needing insulin injections, and Leonard, not remembering he had already given her a dose, repeated the injection and killed her himself. Leonard reassigned this guilt onto Sammy, a man he actually investigated, because he could not live with having caused his wife's death. This reframes the entire "Sammy Jankis" thread the audience watched throughout the film. It wasn't a flashback to a separate case; it was Leonard's rewritten memory of what actually happened to his own wife.
How the Ending Actually Unfolds
In the film's final sequence, which is the earliest point in the story chronologically, Leonard has just heard Teddy's confession. Rather than accept that his real revenge is already finished, Leonard chooses to erase the knowledge that Teddy was involved in the first killing. He burns a photo of Jimmy Grantz, writes down Teddy's license plate number, and resolves to treat Teddy as the next "John G." to hunt.
This means Leonard knowingly sets himself up to kill Teddy later, using the same note-and-tattoo system he uses to deceive himself about everything else. The famous closing line, delivered in his internal narration, is essentially his own justification: he needs a world where his quest still has a purpose, even if that requires choosing not to remember an inconvenient truth. The scene that follows chronologically (but appears earlier in the film) shows Leonard killing Jimmy Grantz, taking his car and clothes, and then shooting Teddy, completing the cycle the opening scene of the film depicted in reverse.
What the Ending Means
The ending argues that memory and identity are something Leonard actively constructs, not just something he has lost. He is not a passive victim of amnesia; he is shown making a deliberate choice to keep a false target alive in his own system of tattoos and notes, because living with a completed revenge and an unbearable truth is worse to him than living in a loop of invented purpose. The reverse structure makes the audience experience Leonard's own disorientation: viewers piece together facts in fragments and have to revise their understanding, the same way Leonard does with every new note he reads.
By the time the "real" sequence of events becomes clear, the film has already shown that Leonard's exterior evidence, Polaroids, tattoos, and notes, can be wrong or fabricated and still feel like certainty to him. The film also uses Teddy and Natalie to show how people with intact memories exploit someone who cannot check their claims. Teddy lies to control Leonard's violence; Natalie manipulates him into assaulting a man who owes her money by telling Leonard that man is "John G." Leonard's condition makes him a tool for anyone willing to hand him a plausible note.
Key Terms and Details to Keep Straight
A few details are easy to confuse on a first viewing, given the reversed structure:.
- Anterograde amnesia: the inability to form new memories after the onset of a brain injury; Leonard still remembers his life and wife clearly from before the attack.
- The two timelines: the color sequences run backward (each new scene is earlier than the last one shown); the black-and-white motel sequences run forward and catch up to the color story at the end.
- Sammy Jankis: the man Leonard investigated for an insurance fraud claim; Teddy says Sammy had no wife, and the insulin-overdose death Leonard describes as Sammy's wife was actually Leonard's own wife, killed by Leonard's repeated injection.
- "John G.": the initials Leonard is chasing; by the time of the film's events, the actual attacker is already dead, and Teddy and Natalie each redirect Leonard toward other men sharing those initials.
- Teddy's real name, John Edward Gammell, is why Leonard's final note ("Teddy, last name begins with G… ") can technically satisfy his own rule for who counts as a target.
Frequently Asked Questions
Did Leonard already kill his wife's real attacker before the film's events?
Yes. Teddy tells Leonard that he helped him kill the real attacker roughly a year before the story's present-day events, making Leonard's ongoing hunt for "John G." a repetition rather than an unfinished mission.
Who actually killed Leonard's wife?
Leonard did, unintentionally. Teddy reveals that Leonard's wife survived the original attack but needed regular insulin injections, and Leonard, forgetting he had already administered one, gave her a fatal second dose.
Is Sammy Jankis a real separate character from Leonard's story?
Sammy was a real insurance claim Leonard investigated, but the specific story of his wife dying from an insulin overdose is Leonard's own trauma, which he reassigned to Sammy to avoid confronting his own responsibility.
Why does Leonard decide to kill Teddy at the end?
After learning the truth, Leonard chooses to burn evidence and treat Teddy as a new target rather than accept that his revenge is already complete, giving himself a reason to keep going.