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Letters credit identified by Greg Theakston and later Harry Mendryk on the Jack Kirby Museum web page http://kirbymuseum.org/blogs/simonandkirby/archives/2369, 31 October 2008 (retrieved 15 December 2014).
On the evidence of the writing credit - Dr. Chuda has advanced mental powers and claims to be 50,000 years old - Kirby may well be the writer.