Mr. Hyde
Nick Name
Civilian ID
Calvin Zabo


Research Scientist

Legal Status
Citizen of the United States with a dual identity criminal record.
Nation or Planet of Origin
Trenton, New Jersey
Group Affiliation

Lethal Legion

Masters of Evil

Base of Operations
New York, New York

Zabo: 5' 11"

Mr. Hyde: 6' 5"


Zabo: 185 lbs.

Mr. Hyde: 420 lbs.

Eye Color
Hair Color

Zabo: Grey

Mr. Hyde: Brown

Known Powers

Chemically activated transformation resulting in a physical and psychologically different being with superhuman strength, speed, stamina, agility and durability.

Note: Zabo's transformation into Mr. Hyde results in physical alterations including a different hair color, facial features and fingerprints.


Hyde Formula: Chemical compound which transforms Calvin Zabo into the monstrous Mr. Hyde.

Common Enemies

Captain America I


Spider-Man I


Regularly Appearing

Amazing Spider-Man Vol. 1

Avengers Vol. 1

Daredevil Vol. 1

Journey into Mystery Vol. 1

Thor Vol. 1

Thunderbolts Vol. 2

First Appearance
Journey into Mystery Vol. 1 #99 (Dec. 1963)
Stan Lee & Don Heck

Convinced that Robert Louis Stevenson's The Strange Case of Dr Jekyll and Mr. Hyde was more than a work of fiction, Dr. Calvin Zabo dedicated himself to the secrets of human transformation. He financed his experiments by embezzling from his clients, and always avoided to stay one step ahead of the law, but he began to earn a reputation in the medical community as someone not to be trusted. When Zabo applied for a position under Dr. Donald Blake (Thor), his rejection engendered a desire for retribution. Dedicating himself exclusively to his quest he found an engine for revenge against those he felt had wronged Dr. Calvin Zabo, as the monstrous Mr. Hyde.