Doctor Double X
Name: Doctor Double X
Universe: Earth-1
Alter Ego: Dr. Simon Ecks
Occupation: Former Research Scientist, now Professional Criminal
Marital Status: Single
Group Affiliation: None
Base of Operations: Gotham City
Known Relatives: None
Height: 5 ft. 9 in.
Weight: 162 lbs.
Hair Color: Gray
Eye Color: Blue
First Appearance: Detective Comics #261
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