Sergei Kravinoff, or Kraven the Hunter, is a hunter who collects tools.
Kraven was hired by Norman Osborn shortly after his transformation into the Green Goblin to capture Spider-Man. He poisoned the web-slinger with a lethal gas, forcing him to track Kraven through zoo corridors filled with traps before he finally found Kraven and defeated him in the center of the zoo.
A year later, the Gaines Twins blasted Peter into believing Mary Jane Watson had been killed at the hands of Kraven and hunted him down. Another year and a few months later, he escaped with aid of Calypso and pursued Dr. Connors' lizards, but was defeated and arrested by Spider-Man in the black suit.