2016–2017: Career beginnings Cathcart, at the age of six or seven, gained a
talent agent and appeared in a few commercials. At the age of 12, following a hiatus, They filmed the series for seven months in
Toronto. The first episode of season 2 "
First Day" aired on 20 June 2016 on PBS Kids and 21 June 2016 on TVOKids. That same year, Cathcart reprised her role for the film
spin-off Odd Squad: The Movie, marking her first theatrical appearance. In November 2016, PBS ordered 20 one to three minute episodes of an
Odd Squad spin-off titled
OddTube. In the series, Cathcart reprised her role as Agent Olympia, the character who hosted the show. In 2017, Cathcart appeared in the
Disney Channel Original Movie Descendants 2, in which she portrayed
Dizzy Tremaine, daughter of
Drizella Tremaine. The film premiered with a
simulcast across six Disney-owned networks, drawing 13 million viewers.
2018–present: To All the Boys franchise and XO, Kitty Cathcart joined the cast of the
film adaption of
Jenny Han's bestselling book ''
To All the Boys I've Loved Before, in which she was to portray 11-year-old Kitty Song-Covey, the younger sister of protagonist Lara Jean. The film was released in 2018 on Netflix and quickly became one of the most viewed Netflix original films. The film received generally favourable reviews and critics praised the actors. Molly Freeman of Screen Rant called Cathcart a "hilarious standout" while Charlie Salek of Joker Mag'' called the supporting performances "crucial". In November 2018, Cathcart was cast in the
Brat web-based series
Zoe Valentine in which she was to portray the
eponymous character. Cathcart had not auditioned but instead was contacted about the role. The first episode, which premiered on January 17, 2019, received 4.9 million views on
YouTube as of November 2020. Cathcart described filming as being "crazy", saying "[it was] such a blur but so much fun".
Zoe Valentine was later renewed for a second season. Cathcart reprised her role as Dizzy Tremaine in the third instalment of the
Descendants franchise,
Descendants 3 in 2019. Cathcart reprised her role as Kitty in 2020 in
To All the Boys: P.S. I Still Love You which had been filmed from March to May 2019, the film being primarily filmed in
Vancouver. Released in February 2020, the film received generally mixed reviews. Cathcart received praise for her performance, with
The Post writing that Cathcart was one of the only members of the returning cast to bring the "same type of energy as [she] did in the first film." She was nominated for the Cogeco Fund Audience Choice Award.. In mid-2020, because of the restrictions placed due to the
COVID-19 pandemic, Cathcart hosted a virtual series called
Letters To which allowed fans to connect with their favourite authors. Developed by
Picturestart and released on
Facebook Watch,
Glitter Magazine wrote that the series had "all literary fans buzzing". Cathcart reprised her role in the third film of the ''To All the Boys I've Loved Before
film series titled To All the Boys: Always and Forever, Lara Jean'', which was mostly filmed in Vancouver,
New York and
Seoul from July to September 2019. Cathcart played Molly in the 2021 Disney Channel Original Movie
Spin.
Principal photography for
Spin began in early October 2020 and wrapped in late November. Cathcart's performance was commended by Amy Amatangelo of
Paste, who called her the "generation's secret weapon" and stated that projects including her were certain to be of high quality. She also reprised her role as Dizzy in the animated special
Descendants: The Royal Wedding, which aired after
Spin. In March 2021, it was announced Cathcart would reprise her role as Kitty Song-Covey in a
To All the Boys spin-off series, later revealed to be titled
XO, Kitty.
TheWrap described her as "appropriately sweet", while
Comic Book Resources stated she "makes a confident jump to a leading role". ==Filmography==