First appearance = Whiz Comics #2 (February 1940) from Fawcett Comics.
NOTE: There was no published "Issue #1" for this book.
First appearance in a new story from DC Comics = Shazam! #1 (February 1973)
And from Who's Who: The Definitive Directory of the DC Universe Vol. XXI (November 1986):
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08-06-2019, 01:31 PM #1Uncanny Member
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Dr. Thaddeus Bodog Sivana - Golden Age villain <orig. Fawcett Comics>
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08-12-2019, 01:02 PM #2Uncanny Member
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While Captain Marvel had The Marvel Family of friends and relatives, Sivana had his own brood:
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08-14-2019, 06:23 PM #3Uncanny Member
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When they tried to re-launch The Original Captain Marvel / Shazam! in the post-CoIE DC universe, they gave Dr. Sivana a family-connection to Billy Batson.
From Who's Who Update '87, Vol. 5 (December 1987):
