Blackie Gaxton appears in the Spectacular Spider-Man (TV Series) as a manager and a bookie voiced by Steve Blum. In "Subtext" Mark Allan owed money to Blackie so in repay Mark was chosen as a "guinea pig" in an experiement which turned him into Molten Man. Later Blackie Gaxton Molten Man took revenge on Blackie by trying to kill him, but was stopped by Spider-Man.
Issues
April 1964
The Amazing Spider-Man (1963) #11 Turning Point
April 1st, 1964
August 1965
The Amazing Spider-Man (1963) #27 Bring Back My G…
August 1st, 1965
August 1984
What If? (1977) #46 What If Spider-Man's Uncle Be…
August 31st, 1984