Igor Drenkov (Earth-616), Marvel Database

Igor was a Soviet spy sent to America to learn the secrets of the Bruce Banner's Gamma Bomb for future purposes of the Soviet Union. When Rick Jones drove out on the test field, Banner asked Igor to postpone the test while he got the kid to safety. Igor, hoping to be rid of Banner in order to steal his secrets, continued the test and the Gamma Bomb exploded, creating the Hulk. Later, when Bruce turned into the Hulk for the first time, he went to Banner's lab and found Igor looking for the Gamma

Hulk (Character) - Comic Vine

Igor Drenkov (Earth-12041), Marvel Database

Marvel DC Characters, PDF, Marvel Entertainment

Igor Marvel Database+BreezeWiki

Hulk (Character) - Comic Vine

Jab's Builds! (Captain Britain! Roma! Merlyn! Saturnyne!) - Page 167 - Echoes of the Multiverse

Mythos: Hulk Vol 1 1 Marvel Database+BreezeWiki

Hulk (Character) - Comic Vine

Igor Drenkov (Earth-523000), Marvel Database

Category:Igor Drenkov (Earth-616)/Mentions, Marvel Database

Igor Drenkov (Earth-616) - Marvel Comics

How does the Hulk compare and contrast with other 'monstrous' characters in fiction, such as Frankenstein's Monster or Godzilla? - Quora

Igor Drenkov (Earth-616) - Marvel Comics

Igor Drenkov (Earth-616), Marvel Database