Arnold made his television debut in 2013 at the age of 10, in an episode of the
IFC television series
Comedy Bang! Bang!. Shortly after that, he had a recurring role in the
Nickelodeon sitcom
Sam & Cat where he played BJ Malloy, the childhood "friend" of Dice, played by
Cameron Ocasio. He subsequently had guest roles in the television shows
About a Boy,
Richie Rich,
Bones,
Goldie & Bear,
Fresh Off the Boat,
Veronica Mars, and
Outmatched. Arnold made his film debut as a young bully in
Hardcore Henry. The film premiered at the
2015 Toronto International Film Festival in September 2015, and was released theatrically on April 8, 2016. Also in 2016, he played Derek Zoolander Jr., the estranged son of Derek Zoolander (played by director
Ben Stiller) in the comedy
Zoolander 2. In August 2017, he was cast in a recurring role as David "Truck" Johnson III in the second season of the
Fox series
The Exorcist. Arnold had a starring role as Borgie in the indie film
Runt, opposite
Cameron Boyce and
Nicole Berger. The film premiered at the Mammoth Film Festival in February 2020, and was released on October 9, 2021. He also had a starring role in the indie film
Run Hide Fight, which premiered at the
Venice Film Festival in September 2020, and was released by
The Daily Wire on their subscription platform on January 14, 2021. Also in 2021, he was cast in an episode of the
Disney+ series
Just Beyond, appeared in the
HBO Max film
8-Bit Christmas as Josh Jagorski, and voiced a character in the animated
Diary of a Wimpy Kid film. He also began voicing Jawbreaker in the
Nickelodeon series
Transformers: EarthSpark. In 2023, he was cast in the comedy film
Family Switch, also for Netflix. ==Filmography==