McIntyre began his career appearing mainly in short films, before performing guest roles in Australian television series
Rush and
Neighbours. He made his American television debut on the
HBO miniseries
The Pacific. After actor
Andy Whitfield's diagnosis and passing from
Non-Hodgkin lymphoma, McIntyre would succeed him in the title role of
Spartacus for the remainder of the series. He made his film debut alongside
Kellan Lutz in
The Legend of Hercules, in the role of Sotiris. On May 4, 2014, he starred on the Channel 7 thriller
The Killing Field. From 2015 to 2016, he completed
The Dream Children and
Albion: The Enchanted Stallion, both independent films as Luke Delaney and Erémon. In 2015, he also starred in
Unveiled, an unsold pilot, and portrayed the recurring villain,
Weather Wizard on
The Flash. In 2016, McIntyre played the lead character
JD Fenix in the video game,
Gears of War 4. In January 2017, he appeared as Jason Andrews in
Apple of My Eye. He played Girth Hemsworth, a fictional Hemsworth sibling on the web series
Con Man and was later cast in
Security, an action-thriller film starring
Antonio Banderas and
Ben Kingsley. He filmed a pilot for
Syfy, titled
The Haunted in January 2017, but it did not receive a full series order. He starred on the Australian medical-drama,
Pulse on
ABC TV. ==Personal life==