The Alternate Ending Of I Am Legend Explained

"I Am Legend" follows Dr. Robert Neville (Will Smith), a survivor of the genetically modified Krippin Virus (KV), which decimates the world population. KV transforms many into vampiric, zombie-like creatures known as Darkseekers, who avoid sunlight and have an insatiable appetite for blood. Neville, a military virologist, stays in Manhattan to study the virus after the outbreak.

Convinced he is the last survivor because of his natural immunity to the virus, Neville ekes out a lonely existence with his dog Sam in a crumbling metropolis being taken back by nature. To maintain his sanity, Neville follows a strict schedule that includes exercising, picking out a DVD at the video store while conversing with mannequins, searching for supplies, waiting by the waterfront at mid-day for other survivors, and locking down his house before darkness each night.

Intent upon finding a cure, Neville spends three years after society has descended into chaos experimenting on the infected animals and humans left in the city. After his dog Sam is infected, Neville goes on a kamikaze mission to take out as many Darkseekers as he can. Survivors Anna (Alice Braga) and Ethan (Charlie Tahan), who hear Neville's radio transmission and come to find him on their way to a rumored survivors' colony in Vermont, try to save Neville from the Darkseekers' attack at the waterfront. 

While the movie ends by tying up a lot of loose ends, there was a more open-ended version planned. Here is the alternate ending of "I Am Legend" explained.

The theatrical cut and the director's cut with an alternate ending are essentially exactly the same until the last five minutes of the film. In both the theatrical version and the alternate ending, Neville thinks Anna's belief in God led her to him when he needed help most. The climax of both versions of the film begins in his laboratory when Neville notices a butterfly and remembers his daughter Marley saying, "Daddy, look at the butterfly," shortly before she died. In both versions of the film, the disheartened scientist suddenly sees a sign, and his interpretations of these different signs lead to two very different endings.

In the theatrical cut, Neville sees a butterfly pattern in the cracks on the glass door, separating Neville, Anna, and Ethan from the mob of Darkseekers. When Neville turns to look at Anna and Ethan crouched against the back wall, Neville notices a butterfly tattooed on Anna's neck as she cradles Ethan, trying to protect him from the frightening onslaught of Darkseekers. Neville decides this butterfly is his sign, and he starts "listening." He gives Anna the blood sample, believing his job is to protect her, so she can get it to the survivors' colony in Vermont, where they can produce and distribute the cure to KV.

Once Neville understands the Darkseekers are sentient beings, he puts down his firearm and takes his test subject, the Alpha Female, out of the protected room at the back of his subterranean laboratory and into the open lab where the Darkseekers wait. Although the Alpha Male is menacing, roaring in Neville's ear to show his anger, the Darkseekers allow Neville to walk into the lab while pushing the gurney the Alpha Female is lying on, and they do not attack Neville because the Alpha Male roars at his followers to reassert his dominance.

Once Neville understands he is experimenting on and killing sentient beings, he brings the Alpha Female out of sedation with a shot and gives her back to the Alpha Male without drawing her blood to make a cure for KV. The tender way the Alpha Male picks up the Alpha Female and how she nuzzles him illustrates that the Darkseekers not only have a social structure built around the leader of their pack — they have feelings. They experience love, pain, and anger like the humans they once were. 

Distraught, Neville apologizes to the Darkseekers, simply saying, "I'm sorry." His expression reveals the depths of his regret.

The alternate ending of "I Am Legend" introduces an unexplored dimension to the story, offering a twist that fundamentally shifts the audience's perception of the protagonist, Neville. It reveals that the Darkseekers have loved ones among them, highlighting the moral ambiguity of Neville's actions. While Neville initially sees himself as a scientist working to find a cure for the virus that had devastated humanity, the Darkseekers certainly view him as the embodiment of their worst nightmares.

Throughout the movie, Neville pursues two main objectives: searching for other surviving humans and seeking a cure for the virus. He lived in a bathtub — a precaution against surprise attacks by the Darkseekers. Interestingly, the Darkseekers never actively hunt Neville until he kidnaps one of their own.

Neville's character takes a darker turn when his loyal dog, Sam, gets infected. In a fit of rage, he goes on a violent rampage, using his car to kill Darkseekers indiscriminately. The phrase "I Am Legend" originates from the book and is what Neville utters when he realizes how the Darkseekers will remember him. 

In the alternate ending, Neville doesn't go out in a blaze of glory to protect the cure he gave to Anna and Ethan, as he does in the theatrical version. Instead, Neville leaves Manhattan with no cure in hand, his research abandoned, with the knowledge of his unethical treatment of Darkseekers during his desperate search for a cure to KV. Neville, Anna, and Ethan drive away from Manhattan, together searching for the purported survivor's colony in Vermont. Neville isn't a hero. He is a survivor blinded by his desperation to fix what KV had done to his world.

When his wife and daughter die during the catastrophic evacuation of Manhattan, Neville puts all of his hope and belief in a future for humanity into finding a cure. Neville is so focused on a cure he can't see the Darkseekers clearly and his obsession with his mission means that the discovery he isn't the last survivor — which occurs when Ethan and Anna arrive — isn't a relief, as it should be. Instead, it is a frustration that contradicts the story he has built in his head that he is the last man alive and the only hope for humanity.

According to a 2014 interview with Money Into Light, in an earlier version of the script, Neville's loyal companion, Sam, met a different fate. "I Am Legend" is best known for Will Smith's ability to carry almost the entire movie with no co-stars, but in reality, the dog is with him in nearly every scene. One of the saddest moments in the film occurs when Sam valiantly fights off the Darkseeker dogs to save Neville but gets bitten and infected in the process. Neville is then forced to make the heart-wrenching decision to euthanize Sam.

However, in an earlier draft of the script, Sam had a different storyline. The movie had been in development for over a decade, with writer Mark Protosevich hired by Warner Bros. in 1995 to adapt the book. In Protosevich's version, Sam is an unnamed male dog who also gets infected by the Darkseekers. But instead of Neville euthanizing his dog, he decides to release him. Later in the climax, there's an interaction between Neville and his infected dog as Neville leads human survivors to a pier. The dog initially joins the Darkseeker dogs in hunting them but eventually decides to return the favor once he recognizes Neville.

This earlier script version would have aligned more closely with the original concept of the story, where the Darkseekers are not mindless zombies but just a more evolved form of life with emotions, connections, and the capacity to make intelligent decisions.

In an exclusive interview in 2018 with Screen Rant, director Francis Lawrence admitted he preferred his original ending to the theatrical cut. Lawrence said, "I agree it's the better ending. I mean, it's the more philosophical version of the end," and does a better job exploring the themes of discrimination and bigotry from the novella. However, Lawrence also explained how the alternate ending breaks all Hollywood movie rules, saying, "but in terms of story math we're doing everything you're not supposed to do, right? The hero doesn't find the cure, right?"

The alternate ending blurs the lines between right and wrong, forcing the audience to confront how gray morality is and how unethical our protagonist is. Lawrence told Screen Rant, "They drive off into the unknown and the creatures you've been saying are the bad ones the whole time you learn actually have humanity and aren't the bad ones — the hero's the bad one."

Lawrence had other regrets about his film, "I Am Legend," and told Den of Geek that he had originally wanted to do the Darkseekers with practical makeup effects but turned to CGI after the test shoot was problematic. "Having done a movie with so many visual effects shots, and then coming to the end, where you have the plug pulled because you have a deadline, and you have to deliver the last reel, and you know there's a hundred shots in the movie you're not satisfied with, was a real disappointment to me."

Despite Francis Lawrence's noncommittal stance on an "I Am Legend" sequel, Akiva Goldsman, who co-wrote the screenplay for the 2007 film, told Deadline, "We're starting with two projects that are fun and very much Warners; the sequel to 'I Am Legend,' with Will [Smith] and Michael B. Jordan, and the sequel to 'Constantine' with Keanu Reeves that Francis Lawrence is going to direct."

Goldsman said "The Last of Us" inspired him to take another look at the "I Am Legend" universe and will pick up a few decades after the original film. Goldsman told Deadline, "We trace back to the original Matheson book and the alternate ending as opposed to the released ending in the original film. What Matheson was talking about was that man's time on the planet as the dominant species had come to an end." It sounds like Warner Brothers is on board for a more thoughtful examination of the themes of the novella, expanding into future decades after the collapse of human society.

Although Goldsman and Warner Brothers haven't revealed who Michael B. Jordan will play or how his character will fit into the new storyline, they have made it abundantly clear Will Smith's return in "I Am Legend 2" is all thanks to the alternate ending.

Will Smith's approach to sequels has evolved over the years. In 2012, he expressed reluctance about appearing in a sequel to "I Am Legend" during an interview with the BBC. However, the landscape of the movie industry has significantly changed since then, with many major actors now starring in one or more franchises. This shift made Smith's involvement in the greenlit sequel less surprising. What might have truly surprised fans, though, is his collaboration with a contemporary and younger movie star, Michael B. Jordan.

According to a 2023 report by Deadline, Akiva Goldsman had a renewed interest in the project after seeing and loving "The Last of Us" — a sentiment shared by many. Goldsman found particular interest in the series' depiction of a world where humanity is no longer the planet's dominant species, as well as in the multi-decade time jump. While Goldsman didn't divulge specific details about the storyline for the "I Am Legend" sequel, he hinted at an exploration of the idea presented by Richard Matheson, where humanity's reign as Earth's primary rulers had ended. He also suggested that the sequel would adhere more closely to the original text.

As for Michael B. Jordan's role in the film, Goldsman remained tight-lipped, leaving the possibilities wide open. While an obvious path involves the two actors teaming up, Jordan's versatility, demonstrated in his portrayal of an antagonist in "Black Panther," suggests the potential for him to play one of the Darkseekers.

Debates among fans about the superiority of books versus their movie adaptations are common, often with each medium having its proponents. In the case of "I Am Legend," however, the consensus leaned toward the book, as the movie arguably presents the story in a less nuanced and shallower manner, favoring common Hollywood tropes, including a heroic self-sacrifice for the greater good.

Interestingly, the movie initially retained the theme of change, a prominent aspect of the book's narrative. However, test audiences reacted unfavorably to the original ending, which revealed Neville's fundamental mistake. This reaction was understandable given the bleakness of that conclusion. The studio's decision to modify the ending to align more with mainstream audience expectations resulted in the removal of the theme of change, which was a core element of the book.

Even symbolic motifs, like the recurring butterfly imagery, are meant to carry deep meaning. Neville's daughter making a butterfly sign before her death and Anna's butterfly tattoo were originally intended to symbolize the Darkseekers' evolution from human beings, mirroring a butterfly's transformation from a caterpillar. The alternate ending reinforces this theme, suggesting that future installments of the story will delve deeper into not only change but also the acceptance of change.