After several minor roles in amateur school productions, Joshua made his breakthrough role in 1999's Scarffies. After good reviews for his gritty role as an un-named Otago university student, he acted in a follow up movie 'Suspicious Shenanigans', in 2000, co starring as Rocky Larry, a gifted student who was prone to shenanigans. After many unflattering reviews, Joshua decided to bow out of acting until his 2011 role in Monster Noir (Constitutionens Voktere #5).