Giant testicular tumour, with volume greater than 10 times a normal testicle, is a rare presentation of testicular cancer. This is of particular note in nations where public health campaigns and high literacy rates generally lead to early detection and cure. We present a 22 year old male, with 14 month history of increasing scrotal swelling. Orchidectomy revealed a mixed germ cell tumour (choriocarcinoma 40%, teratoma 30%, and yolk sac 30%), 250 x 150 × 150mm in size. This case details the largest testicular tumour recorded in Australia, and one of the largest mixed germ cell tumours globally.