Morgan is portrayed by Orson Welles, while Croatian actress Oja Kodar, Welles' companion for the last 24 years of his life, has the role of Katharine Johnson (1855–1924), with whom Tesla corresponded for many years, and whose husband, Robert Underwood Johnson (1853–1937) (portrayed by Croatian actor Boris Buzančić) was a poet, scholar, diplomat and Tesla's longtime friend and supporter.
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The other Americans in the cast are character actors Strother Martin (who died six weeks before the film's September 12, 1980 English-language premiere at the Toronto Film Festival) and Dennis Patrick as Westinghouse and Edison, respectively.
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