Documentary maker Kent Belcher spent six years following Henry and Lewis De Jong, the brothers behind Alien Weaponry - since they were teenagers.
The thrash metal band was formed out of Smokefree Rockquest and as their success grew, Kent was with them as they toured Europe metal festivals - along with most recent band member, Turanga Morgan-Edmonds.
The band's point of difference - particularly within the metal scene - is their use of Te Reo Maori.
Kent's documentary Alien Weaponry: Kua Tupu Te Ara, is screening as part of the New Zealand International Film Festival.