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 As a consequence of the hearings, his license was revoked.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.
Grizzly played an important role in Secret War. He was suspected in getting his exoskeleton upgraded secretly. Maxwell revealed that man named Tinkerer is doing that.
Grizzly has undergone a series of power enhancement procedures that have granted him a variety of superhuman abilities.
Superhuman Strength: Grizzly possesses superhuman strength enabling him to lift about 15 tons under optimum conditions.
Superhuman Stamina: Grizzly's musculature produces considerably less fatigue toxins during physical activity than the musculature of an ordinary human. He can exert himself at peak capacity for about 24 hours before fatigue begins to impair him.
Superhuman Durability: Grizzly is far more resistant to physical injury and trauma than an ordinary human. He is capable of withstanding great impact forces and high caliber bullets without sustaining injury.
Claws & Fangs: Grizzly has had razor sharp and very durable fangs implanted in his mouth and claws within the tip of each finger. Grizzly's fangs and claws have proven capable of rending steel.