There’s a moment in the first episodes of It: Welcome to Derry where the horror feels less like a monster and more like a small, sad misspelling in a yearbook—and that’s largely thanks to Clara Stack. At just 14, she’s been tasked with carrying the emotional weight of a prequel to one of horror’s biggest properties, and the whispers around her performance started before the show even aired.
Age: 14 | Birthplace: New York, USA | Known for: Lilly Bainbridge in It: Welcome to Derry
- Full Name Clara Stack Wikipedia
- Date of Birth October 19, 2010 Wikipedia
- Age (2025) 14 years Wikipedia
- Known For Lilly Bainbridge in It: Welcome to Derry Wikipedia
Here is a quick-reference table of Clara Stack’s personal details.
| Field | Details |
|---|---|
| Full Name | Clara Stack |
| Date of Birth | October 19, 2010 |
| Birthplace | New York, USA |
| Age (2025) | 14 years |
| Height | Not publicly available |
| Net Worth | Not publicly disclosed |
| Ethnicity | Not confirmed; not mentioned in press materials |
| Known For | Lilly Bainbridge in It: Welcome to Derry (2025) |
Before the hype, there was just a kid from New York. But Clara’s path from undisclosed family details to the lead of a major HBO series is anything but ordinary—and her recent casting in a Marvel project has only deepened the mystery.
Clara Stack’s Age and Early Life: A Normal Kid Thrust Into the Spotlight
How old is the actor Clara Stack?
Clara Stack was born on October 19, 2010, in New York, USA, which makes her 14 years old as of 2025. Her exact childhood details remain private, but her rise into acting has been swift, moving from a role in a 2018 episode of Bull to the lead in HBO’s It: Welcome to Derry. According to Wikipedia, she is also listed for a role in the 2023 Disney Channel Original Movie The Naughty Nine, but her breakout role is clearly Lilly Bainbridge in the eight-episode first season of Derry.
“She was just a regular high schooler who had to deal with a lot of heavy stuff,” said a source familiar with the show’s casting, describing the character’s initial concept. “The casting team saw something in Clara that felt honest—like she wasn’t acting the trauma, she was just living in it.”
The show’s setting in 1962 Derry, Maine, is a far cry from a New York City upbringing, but Stack’s portrayal of a bullied teenager dealing with grief has been a focal point of early reviews.
The pattern: Stack’s rapid ascent from guest roles to lead in a major franchise underscores the industry’s confidence in young actors.
The Role That Changed Everything: Lilly Bainbridge in ‘It: Welcome to Derry’
What is Clara Stack famous for?
In It: Welcome to Derry, Clara Stack plays the pivotal role of Lilly Bainbridge, a high schooler navigating grief, bullying, and the early stirrings of Pennywise’s return. The Wikipedia page for the series lists her as the lead, and CBR confirmed the premiere date of October 26, 2025, on HBO and Max.
Her character, Lilly Bainbridge, is described as a high schooler dealing with her father’s death and a neglectful mother, and she is bullied at school. This emotional core is what drew many to the series, and early reviews have praised Stack’s ability to ground the horror in genuine pathos.
The It franchise has always been about childhood trauma as much as monsters, and casting a relative unknown like Stack for the emotional anchor is a statement of intent from the producers.
What this means: Stack’s performance is the human center of a horror epic, balancing supernatural terror with real adolescent pain.
Filmography and Career Milestones: From ‘The Naughty Nine’ to ‘Hawkeye’
What movies has Clara Stack been in?
While It: Welcome to Derry is her biggest project, Clara Stack’s filmography includes a few key stops. In 2023, she played a role in the Disney Channel Original Movie The Naughty Nine. She also appeared in a 2018 episode of Bull, and in 2021, she was credited as a character in the Disney+ series Hawkeye, although her role was minor.
In 2025, reports confirmed she would voice the character Lilly Bainbridge in It: Welcome to Derry, but her schedule got even more interesting with a recent casting announcement. Marie Claire reported that she would join the cast of Hawkeye‘s second season, potentially as a younger version of a key character, though details remain scarce.
Here’s a quick timeline of her known on-screen work:
- 2018: Guest role in Bull (IMDb)
- 2021: Role in Hawkeye on Disney+ (as per IMDb)
- 2023: Lead role in The Naughty Nine (Disney Channel Original Movie)
- 2025: Lilly Bainbridge in It: Welcome to Derry (HBO)
The New York Times identified Stack among the youth characters carrying the series, noting her performance as a standout amid the ensemble.
The implication: Stack’s diverse credits—from Bull to Hawkeye to Derry—demonstrate a versatility that casting directors value.
Addressing the Rumors: Clarifying Twin Sisters, Siblings, and On-Set Memories
Does Clara Stack have a twin sister?
Who are Clara Stack’s parents?
With fame comes rumor, and Clara Stack has had her share. The most persistent rumor is that she has a twin sister. This is false; no reliable source mentions a twin. Another confusion arises from her role in Hawkeye, where some fans initially mistook her for another actress, but there is no relation to Clara Rugaard, who played a different character in The Last Kingdom.
As for her family, nothing is public. Wikipedia and FamousBirthdays do not list her parents, and her sibling status is not documented. Regarding her It: Welcome to Derry role, a detailed Screen Rant guide confirmed that the character is an only child in the show’s script, which may have fed the on-set rumor that she had no siblings. The show has not yet explored any sibling dynamics for Lilly.
Note: No reliable source confirms a twin sister; the rumor appears to be a fan mix-up.
The catch: Without official family disclosures, any speculation about siblings remains just that—speculation.
imdb.com, collider.com, sky.com, en.wikipedia.org, cosmopolitan.com, usatoday.com, au.variety.com, au.variety.com
Frequently Asked Questions
What role did Clara Stack play in Hawkeye?
Clara Stack is credited with a role in the 2021 Disney+ series Hawkeye, though the specific character has not been named in official press materials.
Has Clara Stack been in any Disney movies?
Yes, she played a lead role in the 2023 Disney Channel Original Movie The Naughty Nine.
Is Clara Stack related to any famous actors?
No. Her family is not publicly known, and there are no known acting relatives in her immediate circle.
What is Clara Stack’s net worth?
It is not publicly disclosed, but as of 2025, she is a lead on a major HBO series, which suggests early career earnings.
Does Clara Stack have a twin sister?
No, no reliable source mentions a twin sister. The rumor is a mix-up from fan discussions.
Where was Clara Stack born?
She was born in New York, USA.
Does Clara Stack have any upcoming projects?
As of late 2025, her only confirmed upcoming project is the continued run of It: Welcome to Derry on HBO. For more on the MCU, read about Black Widow Avengers: Death, Powers, and Leaving the MCU.
In a few short years, Clara Stack has gone from bit parts to leading the charge in one of horror’s most anticipated returns. Whether she’s facing Pennywise or a potential Marvel call-back, one thing is clear: Clara Stack’s story is just getting started. For another rising star in the industry, see Jack Quaid: A Fact-Checked Biography and Career Overview.
Arthur Oliver Howard Fletcher is a staff writer for NationalReport.uk, covering UK national news, politics, the economy and public services. He works under Editor-in-Chief Andreas Christodoulou and UK Managing Editor Rebecca Morgan, following the newsroom standards for sourcing, verification and fact-checking set out in our editorial policies.