Thirty-six patients with malignant ovarian germ cell tumors were treated between 1972 and 1983, including 16 with immature teratoma, five with endodermal sinus tumor, seven with dysgerminoma, and eight with mixed germ cell tumors. The median age at presentation was 18 years and mean primary tumor diameter was 18 cm. Twenty-five of the 27 patients who were treated with multiple-agent chemotherapy underwent second-look procedures, only two of which revealed persistent malignancy. No patients have developed recurrence after a negative second-look operation. Two of the three patients with failure of initial chemotherapeutic regimens had complete remissions with second regimens. Two patients have died of malignancy, one who presented with a Stage IA mixed germ cell tumor and one noncompliant patient with a Stage IA, grade 2 immature teratoma. The other 34 patients are alive without evidence of disease from 21 to 141 months, with a median follow-up of 68 months. These data confirm that multiple-agent chemotherapy has dramatically improved the prognosis for patients with malignant nondysgerminomatous ovarian germ cell tumors.