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Doctor Double X
Real Name: Dr. Simon Ecks
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The doctor possessed an energy creature called Double X, an entity living in a symbiotic relationship with Ecks and possessed of extraordinary power. Double X can fly, generate bolts of power, and is super-strong.

Requires repeated infusions of electric energy to sustain Double X's existence. Double X otherwise remains dormant inside Ecks's body.

None entered.


First Appearance: Detective Comics (1937) #261

View a chronological listing of this character's appearances

Issue Appearances:
Batman (1940)
Batman: Dark Detective (2005)
Crisis on Infinite Earths (1985)
Detective Comics (1937)
Legends of the Dark Knight: Marshall Rogers (2011)
Tales of the Batman: Carmine Infantino (2014)
The Batman Family (1975)
The Brave and the Bold (1955)
Titans (2008)
Who's Who: The Definitive Directory of the DC Universe (1985)
World's Finest Comics (1941)
Young Justice (1998)

Group Affiliation(s):

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