Doctor Double X (DC Comics) from the Who's Who

Doctor Double X

Power Level:
Game system: DC Heroes Role-Playing Game


This minor but odd Batman foe first appeared in 1958. He’s thus an early Silver Age  villain, and not a bad example of science-fiction themes becoming widespread in the super-hero DC comics of these days.


  • Real Name: Dr. Simon Ecks.
  • Marital Status: Single.
  • Known Relatives: None.
  • Group Affiliation: None.
  • Base Of Operations: Gotham City.
  • Height: 5’9” Weight: 162 lbs.
  • Eyes: Blue Hair: Gray



Dr. Ecks was a brilliant but naïve scientist. His theories were scorned by his peers. Yet he was able to build a machine that could isolate parts of an individual’s personality and give them a physical form.

However his energy-duplicate, Dr. Double X, was the avatar of all of his evil, negative emotions. The strong-willed Double X turned to a life of crime in order to finance his alter ego’s experiments. The wimpy Dr. Ecks reluctantly went along.

But this ultimate “odd couple” met their match when they crossed paths with Batman and Robin. The Dynamic Duo tracked the two to their lair, and destroyed the machine that gave Double X life. Unable to recall what happened, Dr. X was sent to a sanitarium for treatment.


Dr. Double X is a pale, ghostly figure surrounded by an eerie glow. He wears a yellow tunic with an “XX” symbol on the chest, red trunks, a blue belt, yellow lace-up sandals, and a red cloak and hood with a serrated fin on top. His legs are bare.

He has black hair and an upswept handlebar moustache.

Dr. Ecks is identical in appearance, except that he lacks the unearthly glow and only has a single “X” on his chest.


Dr. X is quiet and timid, well-meaning but easily manipulated.

Double X is his exact opposite: forceful, arrogant, and sadistic. He will do anything to ensure his continued existence and his alter ego’s safety, up to and including murder. Dr. X sometimes tries to curb his double’s nastier tendencies, but usually will go along with whatever Double X has in mind.

In later appearances, Dr. X is more self-assured and actively evil, an equal partner in crime to Double X. I prefer the Jekyll – Hyde pathos of the original version, so that’s how I wrote it up.

Game Stats — DC Heroes RPG

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Dr. Double X

Dex: 08 Str: 12 Bod: 10 Motivation: Psychopathic
Int: 07 Wil: 08 Min: 10 Occupation: Criminal
Inf: 08 Aur: 07 Spi: 08 Resources {or Wealth}: 004
Init: 025 HP: 050

Bomb: 05, Flight: 08, Lightning: 07

None as Double X.

Expansive Headquarters (secret laboratory in the mountains), Iron Nerves, Lightning Reflexes, Miscellaneous: Dr. Double X and his Alter Ego exist at the same time (Double X can disappear into Dr. Ecks’s body and reappear at will).

Controllable Alter Ego, Strange Appearance, Miscellaneous: If the machine that created him is destroyed or runs out of fuel, Dr. Double X will cease to exist.

Alter Ego: Dr. Ecks

Dex: 02 Str: 02 Bod: 02 Motivation: Mercenary
Int: 08 Wil: 03 Min: 02 Occupation: Scientist
Inf: 01 Aur: 02 Spi: 02 Resources {or Wealth}: 004
Init: 011 HP: 025

Gadgetry*: 08, Scientist*: 08

Stroke of Genius, Expansive Headquarters (secret laboratory in the mountains).

Uncontrollable Alter Ego, Innocent, Serious Psychological Instability.

By J. Kevin Carrier.

Helper(s): Sébastien Andrivet.

Source of Character: Detective Comics #261 and others.