This issue has variants.
Distributed to newstands in December 1963. This issue includes 10 pages of paid advertisements.
Distribution date from Joseph Marek's Marvel Comics Group history website.
Letters credit from George Olshevsky's Marvel Comics Index.
Porcupine last appears in issue #48 (October 1963), he next appears in a cameo in Fantastic Four Annual (Marvel, 1963 series) #3 (1965), before appearing in X-Men (Marvel, 1963 series) #22 (July 1966).
Erroneous "George Roussos [as George Bell]" credit removed by Stephane Petit via the GCD Errors list, February 2010.