Acting Arnold appeared on stage in
Tim Conigrave's
Like Stars in My Hands, directed by Robert Chuter at
La Mama Courthouse,
Melbourne in 2008. In the 2000s, he appeared in television guest roles in
City Homicide, ''
McLeod's Daughters, and a recurring role in Winners & Losers'' in 2011. In 2014, he appeared in two major television roles: playing
INXS singer
Michael Hutchence in
INXS: Never Tear Us Apart, and as the pirate John Silver in the
Starz drama series
Black Sails. In 2017, he appeared in all six episodes of the second season of Australian
paranormal drama
Glitch. In 2018, he co-starred in the film
Half Magic as Freedom. 2018 Arnold appeared in 7 episodes in the TV series of Salvation as Bass Shepherd. In 2020, he took on a temporary role of Lewis Hayes in the TV soap opera
Home and Away, playing a nurse with a grudge against a doctor. In 2023, Arnold was named for the upcoming
Stan production
Scrublands. In 2024,
Scrublands was renewed for a second season, with Arnold reprising the role. In 2024, Arnold was announced for the second season of
Last King of the Cross. On 4 September 2024, Arnold was named as part of the extended cast for
SBS drama
Four Years Later. 2024 Arnold appeared in 10 episodes of Nautilus as Captain Billy Millais
Writing In January 2020, Hachette Australia published Arnold's first novel,
The Last Smile in Sunder City. ==Philanthropy==