Real name: Klaus Voorhees

Occupation: Formeer scientific research assistant, now professional criminal

Identity: Publicly known

Legal status: Former citizen of Holland, now citizen of the United States with a criminal record

Place of birth: Rotterdam, Holland

Marital status: Single

Known relatives: None

Group affiliation: Former partner of Mister Hyde, member of the second Serpent Squad, member of the Serpent Society

Base of operation: Serpent Society Citadel, location unrevealed

First appearance and orgin: JOURNEY INTO MYSTERY #98

Height: 5' 10''

Weight: 160 lbs

Eyes: Blue

Hair: Bald