Cyrus Arnold

Arnold was born in Burbank, California, the son of Lea Anne Wolfe and Blake Arnold. He has a younger brother. Arnold was just 8 years old when he had his first taste of acting.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. In 2022, he portrayed Kenny Yankovich in the Netflix film Mr. Harrigan's Phone, a film adaptation of the short story of the same name from the If It Bleeds collection by Stephen King. 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.