Alias

Dark Flash
Nick Name
Hypertime Flash
Civilian ID
Walter "Wally" West
Occupation
Adventurer
Legal Status
Citizen of an alternative timeline United States with a criminal record.
Nation or Planet of Origin
Blue Valley, Nebraska of an alternative timeline.
Group Affiliation

Justice League

Titans
Base of Operations

Keystone City, Kansas

Central City, Missouri

Presumably the same cities in an alternative timeline.
Height
6'
Weight
180 lbs.
Eye Color
Blue
Hair Color
Red
Skin Tone
Caucasian
Known Powers
Chemically and electrically enhanced ability to tap into the energy known as the Speed Force to achieve speeds just short of light-speed; lend speed to or borrow speed from moving objects, create objects of concentrated Speed Force energy, become intangible by vibrating molecular mass, perform both limited time and inter-dimensional travel and heal personal injuries by accelerating his metabolism.

Note: Velocity beyond light-speed causes a merging with the Speed Force. Flash III is the only person known to return from the other side to the Speed Force barrier.
Accessories
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Common Enemies

Abra Kadabra

Captain Boomerang

Captain Cold

Dr. Alchemy

Folded Man

Heat Wave

King Kobra

Mirror Master II

Replicant

Savitar

Weather Wizard
Regularly Appearing
Flash Vol. 2
First Appearance
Flash Vol. 2 #150 (July, 1999)
Creator
Mark Waid & Brian Augustyn
Origin
Walter West apparently lived out his life much like his counterpart Wallace West (Flash III), except that he was unable to save his future wife, Linda Park's life from the cult leader known as Kobra.

Sick with grief, Walter joined forces with the super-speed villain Savitar, learned his tricks of controlling the Speed Force, and murdered him.  Turning his new skills on the criminal element of his timeline, Walter maimed or killed many, making him a wanted fugitive known as the Dark Flash.

The Dark Flash appeared for sometime in the Earth-1 timeline, apparently investigating this timelines Wally West (Flash III) and his predecessor Barry Allen (Flash II).  His motivations and what facts his investigation revealed are unknown.

Eventually Dark Flash's presence began to cause Hypertime instability, forcing him to leave this timeline and seek out his own, or one that would not be threatened by his presence.  His current whereabouts are unknown.