Harry Collett (born 17 January 2004) is an English actor. He began his career as a child actor in the West End. He went on to play Oliver Hide in the BBC medical drama Casualty (2016–2022), Tommy Stubbins in the film Dolittle (2020), and Prince Jacaerys Velaryon in the HBO fantasy series House of the Dragon (2022–2026).
Early life From Havering in London, Collett attended Coopers' Company and Coborn School for his secondary education, completing Year 11 in 2020.
Career Collett began his career in the West End productions of Billy Elliot the Musical at the Victoria Palace Theatre as Small Boy, Matilda The Musical at the Cambridge Theatre as Eric, and Elf at the Dominion Theatre as Michael.
Collett made his television debut in a 2014 episode of BBC medical drama Casualty as Seb Durante. That same year, he played a younger version of Michael Bublé in the music video for Bublé and Idina Menzel's cover of "Baby, It's Cold Outside". The following year, Collett made a guest appearance in the ABC musical comedy series Galavant as a younger version of the titular character (played by Joshua Sasse). He voiced lead character Wally in Wallykazam! across the first two series on the Nick Jr. Channel and Buzzbee in The Hive on CITV.
In 2016, Collett was cast in another guest role on Casualty as Oliver Hide, the son of established character David Hide (Jason Durr) and debuted during the fifth episode of series 31. As part of the appearance, Collett filmed a stunt featuring his character trapped in a car engulfed in flames. He reprised the role in 2017 for three episodes, and again in 2019 for a longer stint. The actor returned for another stint in 2021. The following year in series 36, Collett reprised the role for four episodes, concluding with his character's death during a school shooting in episode thirty nine. Collett's co-star Durr praised the actor, calling him "absolutely fantastic", further remarking, "He's got a great career ahead of him".
Collett made his film debut voicing a younger version of Luke Treadaway's character Raymond Briggs in Ethel & Ernest, an animated biographical film released in 2016. In 2017, Collett appeared in the short film Honour as 11-year-old boy Lee and had a cameo in Christopher Nolan's war film Dunkirk. The following year, he appeared in Dead in a Week or Your Money Back as a younger version of the character William.
In December 2017, it was announced Collett would star as apprentice Tommy Stubbins alongside Robert Downey Jr. in the adventure comedy film Dolittle, which would be released in January 2020. Collett was then cast as Prince Jacaerys "Jace" Velaryon in the 2022 HBO fantasy series House of the Dragon, a Game of Thrones prequel and adaptation of part of George R. R. Martin's companion book Fire & Blood.
In July 2025, Collett was announced in the lead role opposite Lizzy Greene in the movie adaptation of the new adult novel Easy by Tammara Webber.
Filmography
Denotes works that have not yet been released
+ Film roles Year Title Role Notes 2016 Ethel & Ernest Young Raymond Briggs Voice role 2017 Dunkirk Boy 2018 Dead in a Week or Your Money Back Young William 2020 Dolittle Tommy Stubbins 2025Easy Lukas Maxfield Adaptation of the novel of the same name by Tammara Webber
+ Television roles Year Title Role Notes 2014 Casualty Seb Durante Episode: "A Life Less Lived" 2015 Galavant Young Galavant Episode: "My Cousin Izzy" The Hive Buzzbee Voice role, 5 episodes 2016−2022 Casualty Oliver Hide Recurring role, 23 episodes 2022−2026 House of the Dragon Jacaerys Velaryon Main role; 13 episodes
+ Music video roles Year Title Artist Notes 2014 "Baby, It's Cold Outside" Idina Menzel and Michael Bublé
+ Video game roles Year Title Role Notes 2015 Dragon Quest Heroes: The World Tree's Woe and the Blight Below Helix English version
Stage + Stage roles Year Title Role Notes 2010 Billy Elliot the Musical Small Boy Victoria Palace Theatre, London 2013 Matilda The Musical Eric Cambridge Theatre, London 2015−2016 Elf Michael Dominion Theatre, London
References
External links