The dying scientist Hauser knows of missile secrets. In order to preserve this information, the CIA has scientist Hillel Mondoro (McCallum) inject himself with the cerebrospinal fluid extracted from Hauser. However, Hauser's wife Anna (Palmer) turns out to be pro-Nazi, and the memory of this woman also become imprinted on Mondoro's mind. Hauser's memory starts to take control of Mondoro and causes him to try to even out some old scores.
^Quinlan, David (1983). The illustrated guide to film directors. Rowman & Littlefield. p. 257. ISBN0-389-20408-0.
^Nicholls, Peter (1979). The Encyclopedia of science fiction: an illustrated A to Z, Volume 1979, Part 2. Granada. p. 276. ISBN0-246-11020-1.
^Baskin, Ellen; Enser, A. G. S. (2003). Enser's filmed books and plays: a list of books and plays from which films have been made, 1928-2001 (6th ed.). Ashgate Publishing, Ltd. p. 179. ISBN0-7546-0878-6.
^ abWright, Gene (1983). The science fiction image: the illustrated encyclopedia of science fiction in film, television, radio and the theater. Facts on File. p. 184. ISBN0-87196-527-5.
^Kelly, Mark R. "1971 Hugo Awards". Locus INDEX to SF Awards. Locus Publications. Retrieved 2010-05-21.