Grizzly was a wrestler known as Maxwell Markham. He appears to be one of Spider-Man's enemies. His first appeariance was in The Amazing Spider-Man #139 (December 1974).
Maxwell Markham was a professional wrestler whose brutal tactics caused J. Jonah Jameson to write a scathing editorial calling for an investigation by the wrestling commission. As a consequence of the hearings, his license was revoked. Later, he obtained a suit that augmented his strength from the Jackal. Recently, Grizzly has undergone a number of augmentation procedures and now possesses superhuman powers without the use of his exo-skeleton. He no longer uses it or his grizzly bear costume.
At one time he was a part of the Spider-Man Revenge Squad.
He was later enlisted into the Thunderbolts.