"Six Months Ago" is the tenth episode of the first season of the American superhero drama television series Heroes. The episode was written by co-producer Aron Eli Coleite, and directed by executive producer Allan Arkush. It originally aired on NBC on November 27, 2006.

The series tells the stories of ordinary people who discover that they have superhuman abilities and how these abilities take effect in the characters' lives as they work together to prevent catastrophic futures. In the episode, Hiro travels back in time in order to save Charlie, only to realize that her fate is sealed.

According to Nielsen Media Research, the episode was seen by an estimated 15.56 million household viewers and gained a 5.5 ratings share among adults aged 18–49. It received mostly positive reviews from critics, who praised the character development and answers to some of the series' mysteries, although some were critical of Matt's role in the episode.

Hiro Nakamura arrives at the Burnt Toast Diner six months in the past after attempting to go back only a single day. Charlie, the waitress he is there to save, serves him.

Jackie arrives at Claire's bedroom and informs Claire that she got her the open cheerleading position. Jackie is surprised at Claire's lack of enthusiasm and threatens to give the position to someone else. A struggle ensues for the outfit, ending with Claire's hand crashing through a glass cabinet door after both girls lose their grip. Her mother helps clean the wound before taking her to the emergency room. Mr. Bennet then receives a phone call from Chandra, who tells Mr. Bennet that they must speak about Claire.

Hiro continues his attempts to explain to Charlie that he teleported from the future. As it rains outside, Hiro realizes that he teleported back too far, since it was not raining the day before he teleported, and it is, in fact, Charlie's birthday in April. He considers trying to teleport again, but is afraid of where he might end up and decides against it.

Hiro brings a newspaper to the diner and shows Charlie the results of a Japanese baseball game where the Swallows beat the Dragons. Hiro comments on how flawlessly she reads the Japanese article after only one day, but her skepticism has not waned. They begin to discuss origami. Charlie comments that a person who folds a thousand cranes will be granted one wish. Hiro then uses his powers to stop time and fill the diner with 1000 cranes on strings, and also offers her a one-way ticket to Japan. He states that he doesn't care if she believes him, but only wishes for her to accompany him to Japan.

At Chandra's apartment, Chandra talks to Gabriel while performing some tests. Chandra asks Gabriel why he did not change professions instead of fixing clocks like his father, to which Gabriel references a phrase from Chandra's book about "evolutionary imperative," claiming that evolution compels creatures towards certain behaviors. Chandra appears to be disappointed upon completing the tests, telling Gabriel that he appears to be "healthy." Gabriel is also disappointed and asks whether Chandra will perform additional tests. Chandra says he may have been wrong; Gabriel may not have any special powers, despite being on his list. Gabriel begs for more tests to be done, but Chandra says there are others in need of his time. Gabriel browses through folders of other suspected evolved humans and asks whether he thinks Brian Davis, who Chandra suspects of being telekinetic, is important or whether Chandra will give up on him too, getting him kicked out. Gabriel's temper causes Chandra to make him leave. On the street, Gabriel glances at Brian Davis's name and address, written on the Post-It he took off the folder. As Gabriel leaves, Mr. Bennet exits a cab and approaches the building.