Synopsis by Hal Erickson
Ricardo Montalban guest-stars as Gerard Sefra, formerly the sadistic overseer of the defunct Boradur penal colony. Sefra has somehow come into possession of a sample of Cesium 138, the catalyst for a low-cost nuclear arsenal. To prevent Sefra from selling the Cesium to the highest bidder, the IMF agents concoct a scheme to destroy both the catalyst and the villain--a scheme that hinges on digging a tunnel underneath Sefra's stronghold in Boradur. Written by Judith Barrows and Robert Guy Barrows, "Snowball in Hell" originally aired February 18, 1967.