Doctor Double X

Doctor Double X (Simon Ecks; originally called Doctor X and Double X) is a supervillain appearing in comics published by DC Comics. He has fought Batman several times in Gotham City.

Publication history
Doctor Double X first appeared in Detective Comics #261 (November 1958), in a story titled "The Amazing Dr. Double X" by Bob Kane, writer Dave Wood and artist Sheldon Moldoff.

Fictional character biography
Dr. Simon Ecks is a scientist who discovered that human auras could be enhanced to function outside of the body. When Ecks created an energy-duplicate of himself, his mind became dominated by the doppelgänger he named Double X. He fought with Batman and Robin. The resulting battle causes Ecks to lose his memory of the experience, after which he is remanded to Arkham Asylum.

Some years later, Ecks regained his memory and developed another duplicator device that enabled him to escape from Arkham Asylum. Doctor Double X matched wits once again with Batman. This time, Batman was able to defeat him by building his own machine that generated an energy duplicate of himself.

Doctor Double X later escaped from Arkham Asylum and faced off against Batman and Superman. This time, it took both Batman and Superman to overcome him.

Doctor Double X once traded opponents with Rainbow Raider after meeting the motivational therapist Professor Andrea Wye. Both of them are defeated by Batman and Flash.

Doctor Double X was later seen as a guest at the San Francisco sci-fi convention. He was sitting next to Beast Boy, who learned that Doctor Double X was washed up and forgotten.

In "The New 52", a reboot of the DC Comics universe, Batwing encounters Simon Ecks in the tunnels beneath Arkham Asylum. While he informs that most of the Arkham Asylum staff was either taken or killed, he warns Batwing to stay back as there is something inside that wants to kill. As a spirit rises from his body and starts to reach towards Batwing, Jim Corrigan shows up and knocks out Ecks as he states that the spirit is a Tulpa. When Batman dispels a ghost in a cemetery, it causes the supposed death of a man wearing an ID badge that has his name on it. Batman then has Julia Pennyworth contact Batwing to look up any info on Ecks.

Powers and abilities
Doctor Double X's energy-duplicate shares his consciousness, but can also act alone. It also has the powers of flight, super strength, and creating energy blasts, but requires regular infusions of electrical energy to sustain itself or else it will become dormant.

Television

 * Doctor Double X appears in Batman: The Brave and the Bold, voiced by Ron Perlman. This version was responsible for the nuclear meltdown that created Firestorm, which was intended to boost his own power.
 * Dr. Simon Ecks appears in Young Justice: Outsiders, voiced by Troy Baker. This version possesses the ability to duplicate himself and is a world-renowned geneticist who operates in a children's hospital in Markovia while secretly experimenting on children to activate their metagene on Baron Bedlam's behalf.

Film

 * According to concept art, Doctor Double X was originally planned to appear in The Lego Batman Movie.
 * Doctor Double X appears in Scooby-Doo! & Batman: The Brave and the Bold.

Miscellaneous
Doctor Double X appears in Justice League Adventures #29. This version became stranded in "Dimension X", a zone located between space, after stealing a teleportation device from Japanese scientist Ryko. In the present, Double X uses the device to remotely wreak havoc on Earth before the Justice League defeats him and he is brought back to be imprisoned on Earth.