Sadie Sink In The Summer I Turned Pretty Season 3? Unpacking The Viral Fan-Casting Rumor

The internet is a powerful place for fan theories, and few have been as persistent and widespread as the idea of Sadie Sink joining the cast of *The Summer I Turned Pretty* (TSITP). As of December 2025, with the highly anticipated third and final season of the Prime Video hit officially on the horizon, the question of whether the *Stranger Things* star will grace Cousins Beach continues to trend, driven purely by the fervent desire of the show's massive fanbase. The truth, however, is that while the Emmy-nominated actress has captivated audiences in roles ranging from the resilient Max Mayfield to the heartbroken protagonist in Taylor Swift’s *All Too Well: The Short Film*, there has been no official confirmation, casting news, or credible leak linking Sadie Sink to the *TSITP* universe. The phenomenon is a perfect storm of fan-casting and a case of mistaken identity that keeps the rumor alive.

The rumor gained significant traction not just from fans imagining her in the role of Belly Conklin or a new character, but also from a brief moment of confusion when new cast members were announced. When Zoé De Grand Maison was revealed to be joining the cast as Agnes, some viewers did a double-take, momentarily mistaking her for the famous red-headed star, which reignited the casting speculation across social media platforms. Despite the show’s actual lead, Lola Tung, being perfectly cast as Belly, and the final season’s plot being confirmed to follow the third book in Jenny Han’s trilogy, the appeal of seeing Sadie Sink bring her unique dramatic intensity to the world of Conrad and Jeremiah Fisher remains an irresistible thought for many viewers.

Sadie Sink: A Complete Profile and Filmography

Sadie Sink has rapidly become one of Hollywood's most sought-after young actresses, known for her ability to portray complex, emotionally rich characters. Her career trajectory from Broadway to global streaming sensation provides a clear picture of her talent and star power.

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• Full Name: Sadie Elizabeth Sink
• Date of Birth: April 16, 2002
• Place of Birth: Brenham, Texas, U.S.
• Height: 5 ft 3 in (160 cm)
• Career Start: Began acting in local theater at age seven.
• Broadway Debut: Played the title role in the musical *Annie* in 2012.
• Breakthrough Role: Max Mayfield in the Netflix series *Stranger Things* (starting in Season 2).
• Notable Film Roles: *The Glass Castle* (2017), *The Whale* (2022).
• Music Video/Short Film: Starred as 'Her' in Taylor Swift's Grammy-winning short film *All Too Well: The Short Film* (2021), directed by Swift herself and co-starring Dylan O'Brien.
• Recent Projects: Continues her role as Max Mayfield in the highly anticipated *Stranger Things* Season 5.

Her experience spans intense drama (*The Whale*), horror-tinged sci-fi (*Stranger Things*), and poignant romance (*All Too Well*), proving her versatility. This wide-ranging experience is precisely why fans believe she could seamlessly transition into the sun-drenched, emotionally charged world of Cousins Beach, even if the role is not Belly Conklin.

The Fan-Casting Phenomenon: Why Fans See Max Mayfield at Cousins Beach

The persistent fan-casting of Sadie Sink in *The Summer I Turned Pretty* is a fascinating example of how audiences merge their favorite stars' personas with new fictional worlds. The desire to see her in the Prime Video series stems from several key factors:

The 'Max Mayfield' Factor

Sadie Sink’s portrayal of Max Mayfield in *Stranger Things* is a masterclass in conveying vulnerability and strength. Max is a character defined by her internal struggles, her sharp wit, and her deep capacity for love and loss. This dramatic depth is a stark contrast to the lighter, more romantic tone of *TSITP*, but fans argue that the series could benefit from a character with Max's edge.

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The comparison often revolves around her intense emotional scenes, particularly in *Stranger Things* Season 4, which demonstrated a level of dramatic acting that fans believe could elevate the already high-stakes love triangle between Belly, Conrad, and Jeremiah. The idea of Sadie Sink playing a new "outsider" character—perhaps a rival for one of the Fisher brothers, a new friend for Taylor, or even a cousin from the Fisher side—is a popular theory.

A Different Kind of Love Story: All Too Well's Influence

Sadie Sink’s starring role in *All Too Well: The Short Film* cemented her status as a compelling romantic lead capable of handling complex relationship dynamics. In the short film, she portrays a young woman navigating a toxic, significant age-gap relationship, showcasing a raw, heartbreaking performance.

This performance resonated deeply with the same young adult demographic that devours *TSITP*. Fans saw her embody the kind of intense, all-consuming, and often painful young love that is the foundation of the *TSITP* narrative. Her ability to convey deep emotion with just a look or a subtle gesture made her a perfect candidate in the minds of fans for a show centered entirely on the emotional turmoil of first love and heartbreak.

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Visual and Aesthetic Similarities (The Zoé De Grand Maison Confusion)

The initial wave of rumors was unintentionally fueled by the physical resemblance between Sadie Sink and Zoé De Grand Maison, who was cast as Agnes for Season 3. Both actresses share a similar youthful look and presence, leading to a brief but impactful moment of mistaken identity online. Furthermore, the aesthetic of Sadie Sink—with her striking red hair and vintage-inspired fashion sense—is often compared to the soft, nostalgic, and often preppy style of the Cousins Beach universe, making the visual fantasy of her in the show easy to achieve for fan artists.

The Final Summer: What We Know About TSITP Season 3 (2025)

While Sadie Sink will not be joining the cast, the real news is the official premiere date and details for the final chapter of Belly’s story. *The Summer I Turned Pretty* Season 3 is officially scheduled to return on Wednesday, July 16, 2025, exclusively on Prime Video.

Here are the key details fans need to know about the final season:

• The End of an Era: Season 3 will be the final season of the series, concluding the adaptation of Jenny Han's beloved trilogy.
• Episode Count: The season will consist of 11 episodes, a slight increase from the previous two seasons.
• The Book Adaptation: This season is expected to follow the plot of the third book, *We’ll Always Have Summer*. This means the central focus will be on Belly Conklin finally making her ultimate choice in the love triangle between the Fisher brothers, Conrad and Jeremiah.
• Key Plot Points: Early plot details and recaps suggest the season will involve a significant time jump, the fallout from a past betrayal, and the continuing romantic and familial drama that defines the Fishers and Conklins. Steven and Taylor’s on-again, off-again relationship will also be a major subplot.

The narrative is already packed with intense emotional stakes, leaving little room for a major new character like one Sadie Sink would portray. The show's focus will be entirely on resolving the long-standing love triangle and providing a satisfying conclusion for the millions of fans who have followed Belly's journey from her "turning pretty" to her final choice.

Beyond the Rumor: Sadie Sink's Future Projects and Why the Fan-Casting Matters

Although the dream of seeing Sadie Sink at Cousins Beach will likely remain just a fan-casting fantasy, the phenomenon itself speaks volumes about her star power and the desire for genre-bending television. Sadie Sink is currently focused on major projects that will keep her at the forefront of the industry, most notably the final season of *Stranger Things*, where the fate of Max Mayfield is a central cliffhanger.

The fan-casting of a high-profile actress like Sadie Sink into a show like *The Summer I Turned Pretty* highlights a crucial trend in modern media: the blending of 'nerd culture' and 'pop culture.' The fans who love the intense, dark world of Hawkins, Indiana, are often the same ones who adore the breezy, romantic drama of Cousins Beach. This cross-pollination of fandoms creates viral moments and showcases the immense talent of young actors who can transcend a single genre.

While viewers won't see her alongside Lola Tung, Christopher Briney, and Gavin Casalegno in the final season, the speculation ensures that both Sadie Sink and the final episodes of *The Summer I Turned Pretty* Season 3 remain central topics of conversation as the July 2025 premiere date approaches. Her continued success in diverse projects, including her critically acclaimed work in *The Whale*, ensures she is one of the most exciting talents to watch, whether she is battling Vecna or starring in a heartbreaking short film.