Broken Barrier marked the first New Zealand dramatic feature to be made since 1940. Its production saw directors John O'Shea and Roger Mirams crowding into a Vauxhall with two silent cameras, one picked up "from a dead German in the Western Desert". Ditching dialogue for 'spoken thoughts', the pioneering film examines cultural complications in a romance between a Pākehā journalist (Terence Bayler) and a Māori nurse (Kay Ngarimu, aka Keita Whakato Walker). According to O'Shea, some viewers considered it "a dirty movie" for spurring mixed race relationships.