Kotze was was a physicist who was employed by SPECTRE to examine and adapt the atomic bombs which the organization had stolen from the British. He appears in both the novel Thunderball and its film adaptation, in the latter re-named Ladislav Kutze.
In the Ian Fleming novel Thunderball, the character is instead referred to simply as Kotze. Kotze, SPECTRE no. 5, was an East German physicist who had defected. He survived the events of Thunderball, but was captured and told all he knew about SPECTRE.