Helen Parr (née Truax), also known as Elastigirl or Mrs. Incredible, is a fictional character in Pixar's The Incredibles franchise. A superhero with superhuman elasticity, she is able to stretch and contort her body to extreme lengths and shapes. The wife of Bob Parr (Mr. Incredible) and mother of Violet, Dash, and Jack-Jack, she first appears in the animated film The Incredibles (2004), where she and her family emerge from government-mandated retirement to battle the supervillain Syndrome. In its sequel, Incredibles 2 (2018), she is recruited to lead a public relations campaign in relegalizing superheroes, while a new villain attempts to tarnish their reputation permanently.

The character was created by The Incredibles' screenwriter and director, Brad Bird, who gave her elasticity to symbolize the multitasking demands placed on mothers. Animators used a layered rig system and custom deformation tools to animate her stretching abilities, establishing her as the most complex rig Pixar had utilized up to that point. For the sequel, which shifts focus to Helen, technological advancements made in the 14 years since the original film granted more complex animation of her stretching, hair, and clothing, while the writers also made a concerted effort to humanize her character. She is voiced by actress Holly Hunter.

Helen received a positive response from film critics, who praised her characterization, the animation of her superpowers, and Hunter's performance. The character's portrayal prompted a range of reactions concerning themes of feminism, gender roles, and working women across both films, with commentary ranging from praise to criticism. Helen has been recognized by multiple publications as one of Pixar's greatest characters and one of fiction's most notable on-screen mothers, while critics have discussed her role in relation to the scarcity of lead female superheroes in superhero films.

Following the release of the sequel, Helen's exaggerated physique became a topic of widespread media discussion. Some commentators viewed her full-bodied appearance as a positive representation of women's bodies in animation, while others expressed concern that the character was being sexualized in a film primarily aimed at children. The character's likeness has been used in various tie-in media and merchandise.

Helen Truax first appears in The Incredibles (2004) as Elastigirl, a superhero with superhuman elasticity. Following the government's ban on superheroes due to a series of accidents and lawsuits, she marries fellow superhero Bob Parr (Mr. Incredible) and retires. The couple has three children, Violet, Dash, and Jack-Jack, and insists that they conceal their own powers to remain hidden among civilians. While Bob struggles with the loss of his superheroic identity, Helen adapts to domesticity as a housewife easier than her family, but becomes increasingly concerned by Bob's aloofness as he secretly resumes hero work. Suspicious of his behavior, Helen consults costume designer Edna Mode, who reveals Bob's actions and location, restores her confidence, and outfits her with a new super suit. She tracks Bob to Nomanisan Island, where she infiltrates the base of Syndrome (Buddy Pine), a crazed inventor and former superfan of Mr. Incredible's who turns against him for dismissing him as a child. Unbeknownst to her, Violet and Dash stowaway aboard her chartered jet; it is destroyed by Syndrome's missiles but they narrowly survive. After reuniting with Bob on the island, the family is captured but manages to escape and return to Municiberg, where they defeat Syndrome's final Omnidroid. Back home, Syndrome attempts to abduct Jack-Jack, but the baby unexpectedly manifests powers and escapes. Helen catches Jack-Jack midair by transforming into a parachute, while Syndrome is ultimately killed when his own cape is caught in his aircraft. The film ends three months later, with the family preparing to confront a new threat, the Underminer.

In Incredibles 2 (2018), Helen is recruited by telecommunications moguls, siblings Winston and Evelyn Deavor, to lead a public relations campaign aimed at restoring public support for superheroes, who remain outlawed after the Parrs fail to apprehend the Underminer. Chosen over Bob due to her lower history of collateral damage, Helen becomes the public face of the movement and undertakes solo missions designed to demonstrate the value of superheroes, while Bob remains home with the children. During one of these missions, she encounters a mysterious villain called the Screenslaver, who uses hypnotic signals transmitted through screens and goggles to control others. Helen eventually discovers that Evelyn is the Screenslaver, motivated by a belief that society's faith in superheroes contributed to her parents' deaths. Evelyn hypnotizes Helen and Bob, and attempts to sabotage the campaign by using them to crash a luxury ship it into the city. Helen is ultimately freed when Jack-Jack uses his powers to remove her goggles, allowing her to free Bob and Frozone, and intercept Evelyn. With her family's help, Helen apprehends Evelyn during her attempted escape and, after stopping her from throwing herself to her death, hands her over to the police.

Screenwriter and director Brad Bird had pitched The Incredibles to Pixar as a scenario where a superhero family is forced to live as civilians in a witness relocation program. While the father is stuck reliving his past, the mother, Helen, embraces their new life to the point where she has severed "a certain part of herself that is still alive ... she thinks that she's not missing anything, but it turns out that she is a little bit". Bird said that, by the end of The Incredibles, Helen "has no intention of slowing down ever, and is rediscovering and reawakening that side of her". He created Helen as a tribute to "the typical modern-day mom", and cited his own wife as inspiration for the character. Wanting the family's powers to symbolize typical nuclear family roles, he gave Helen elasticity to represent mothers who are constantly "juggling a million things and [being] pulled in a million directions".

Originally, the script included a scene where Helen defends her decision to be a stay-at-home mother from a businesswoman who openly mocks the term. It was inspired by interactions Bird's wife had with her peers when she had first decided to be a homemaker and found that several people reacted dismissively. The scene was storyboarded but cut when the writers decided to open the film by introducing Helen and Bob as younger superheroes instead of a normal couple. One of the earliest ideas Bird had conceived for the film was when Helen notices her reflection after breaking into a supervillain's lair, and wearily acknowledges the weight she had gained since last donning a supersuit. Bird said this demonstrates some of the mundane, relatable feelings the titular family struggles with despite their extraordinary talents. Although there were some concerns that this moment would unintentionally undermine or sexualize the character, most of the crew understood Bird's intentions to make her more interesting, flawed, and relatable. Pixar had asked Bird to rewrite an argument between Helen and Bob because they feared it looked like she was being bullied by her husband. Instead of changing any dialogue, the director had Helen stretch to meet Bob's height to visually establish that "she's not intimidated by him, she's just as tough as he is".