Connor made his onscreen debut at the age of eight with minor appearances in
Chickens on
Sky One, the television film
An Adventure in Space and Time, and the soap opera
Casualty. In 2014, he starred as Tom Anderson in the holiday comedy
Get Santa, and as a recurring character Archie Beckles in the
CBBC series ''Rocket's Island''. Connor had a recurring role playing young
Petya Rostov in the miniseries
War & Peace and as Bob Sheehan in the miniseries
SS-GB. He made his stage debut in
Welcome Home, Captain Fox! at
Donmar Warehouse. He had roles in the 2018 films
The Mercy,
The Guernsey Literary and Potato Peel Pie Society,
Slaughterhouse Rulez, and the
BBC One television film ''
Grandpa's Great Escape. He starred as Alexander in the Old Vic Theatre production of Fanny & Alexander''. In 2019 Connor portrayed a teenaged
Elton John in the musical film
Rocketman, and played Joe Woodard in the drama
Little Joe. In the same year, he began voicing the part of Pantalaimon in the
BBC One and
HBO fantasy series
His Dark Materials. In April 2021, it was announced that Connor would star opposite
Joe Locke in the
Netflix series
Heartstopper, an adaptation of the
webcomic and graphic novel of the same name by
Alice Oseman. He originally auditioned for the role of Charlie but ended up cast as the other lead,
Nick Nelson. In 2024 Connor was part of the voice cast of
DreamWorks Animation's
The Wild Robot, an adaptation of
Peter Brown's novel of the same name. He made his
Broadway debut playing Romeo opposite
Rachel Zegler's Juliet in a musical adaptation of
William Shakespeare's
Romeo & Juliet directed by
Sam Gold with music by
Jack Antonoff. In 2025, Connor appeared in
Warfare, an
A24 war film written and directed by
Alex Garland and Ray Mendoza. In April 2025 it was announced that Connor will star in a
Heartstopper feature-length film that will serve as the series conclusion. He will also serve as an executive producer of the film. In May 2025 it was announced that Connor will star alongside
Will Poulter and
Manu Rios in the medieval zombie horror film
Rapture. In October 2025 it was announced that Connor will star alongside
Fred Hechinger and
D'Pharaoh Woon-A-Tai in
Andrew Haigh's
A Long Winter. Connor will also next star in an upcoming film adaptation of the novel ''A Cuban Girl's Guide to Tea and Tomorrow'' by Laura Taylor Namey. In March 2026 Connor led the cast of the mystery-horror film
One of Us, which had its world premiere at the
Manchester Film Festival. In April 2026 it was announced that Connor would voice the lead character in the new
Netflix animated movie
Charlie vs. the Chocolate Factory alongside
Taika Waititi as Wonka. Also in April 2026, Connor was formally confirmed as the lead in the
Alex Garland adaptation of
Elden Ring for
A24, with an official release date of March 3, 2028. Production commenced that month. Connor was named a 2023
Screen International Star of Tomorrow. In 2024 Connor was named to
Forbes'
30 under 30 Europe list in the Entertainment category. He was also highlighted in
Variety's Young Hollywood Impact Report and on
The Hollywood Reporter's 2024 Next Gen Talent list. ==Personal life==