Doctor Alchemy

Origin
Albert Desmond suffered from multiple personality disorder where, like Two-Face, one side was a harmless citizen, the other personality was a dark criminal. Utilizing his knowledge of chemistry, Desmond began his criminal debut under the guise ofMister Element.

Rogues
After being sent to jail by Flash, Desmond somehow found the Philosopher's Stone, which had the ability to transmute one element to another. After using the Stone to escape, Desmond restarted his criminal career under the new moniker of Doctor Alchemy and clashed with Flash many times, but was defeated every time.

Eventually, Desmond's good personality resurfaced and he quit crime and hid the Stone. However, a new Doctor Alchemy appeared, who turned out to be Alvin Desmond, Albert's identical twin whom he shares a psychic link with. It was later revealed that the "twin" was a construct of Albert's evil by the Stone itself. The construct was eliminated, though Albert became Doctor Alchemy again and joined the Rogues.

Abilities

 * Alchemy
 * Chemistry

Weaknesses

 * Multiple Personalities

Equipment

 * Philosopher's Stone

Weapons

 * Element Gun

Alvin Desmond
Alvin Desmond was a construct of the Philosopher's Stone. He existed as the virtual twin of the original Doctor Alchemy Albert Desmond. Temporarily replacing Albert, Alvin became a member of the Rogues gallery for a brief period of time. The construct was eventually eliminated and Albert became Doctor Alchemy again and joined the rogues.

Curtis Engstrom
Dr. Curt Engstrom worked for S.T.A.R. Labs in Keystone City. They obtained Dr. Alchemy's Philosopher's Stone, a stone with the capability of transmuting the elements. The scientific firm shaved off a microscopic portion of the stone, using it for the construction of a miniature medical computer that could go through the bloodstream, transmuting free radicals into iron, curing blood disease. Engstrom stole the computer and the Stone, ransoming them. He was later arrested. They did not recovere the computer chip. Engstrom tried to use Moe "Mouthpiece" Migliani, the famous jailhouse lawyer, to get out. He told Migliani the location of the microcomputer. The lawyer purposely botched the case so he could get his own hands on the chip instead.

Engstrom did escape, however, and using the Philosopher's Stone, he devised a costume similar to that of the original Dr. Alchemy. Calling himself the Alchemist, he went after Migliani in a bank. Police Commissioner Hotchkiss asked the Flash to escort Migliani around, to protect him from Engstrom. However, Migiliani was scheduled to appear on WKEY's Fernando talk show. The Alchemist tracked him there. After temporarily stalling the Flash by turning the nitrogen around him into gold, Engstrom captured Migliani. The Flash followed them, and was able to defeat Engstrom. Wally noticed that the watch that Migliani had given him earlier was not keeping proper time, which clued him that the chip was in fact inside the watch, proving that Migliani had stolen it. So both Engstrom and Migliani were put behind bars.

Equipment
Philosopher's Stone

Alexander Petrov
Alexander Petrov is a criminologist working for the Keystone City Police Department. In order to advance his career he uses one of weapons Albert Desmond used as Mister Element to freeze the lab supervisor solid. Petrov is promoted to replace the dead supervisor and discovers he likes the thrill of killing. He continues to eliminate members of the department he sees as "threats" to his position using the weapon and ice based effects. He uses the effects and his position as head of the crime lab to shift suspicion to Captain Cold. His plan comes undone when profiler Ashley Zolomon enters his officce as he is putting on his mask. The Flash is able to stop him from killing her but Captain Cold interrupts them before the Flash can take him into custody. Cold kills Petrov for breaking the Rogues' code of "ethics" - framing another Rogue for your own crimes

Weapons
Element Gun

Television History
Both the Doctor Alchemy and Mister Element versions of the character were adapted for non-speaking cameos in the episode "Flash and Substance" of the animated series Justice League Unlimited.