The testicular tumour is the most common solid malignancy in males between the ages of 15 and 35 years. Testicular tumours most commonly present with a painless testicular mass. Fournier???s gangrene is necrotising fasciitis of the genital, perineal, and perianal region characterized by the microvascular thrombosis and skin necrosis, and is most commonly seen in elderly males with the comorbid conditions. To the best of our knowledge, there is no published case of testicular tumour presenting as Fournier???s gangrene. Herein, we report a case of a young adult male, otherwise healthy, who presented to the emergency room with Fournier???s gangrene and was found to have a metastatic post-pubertal pure yolk-sac tumour of the testis which is extremely rare in the adults.