Chronos is the name of several fictional character of DC Comics, both supervillain who take their name from the Greek personification of Time and have the ability of time travel and can manipulate history.
Considered by some to be the arch-nemesis of the Atom (Ray Palmer), Chronos started his career as petty thief David Clinton who attributed his consistent incarceration to his timing, or lack thereof. To improve his timing, he studied the rhythm of time pieces and by practice he learned to synchronize each of his actions with the beat of the prison clock. By the end of his sentence he had developed an extraordinary sense of timing which he resolved to use to further his criminal career. He then adopted the colorful costume and alter ego of Chronos, the Time Thief. Clinton had acquired an unhealthy fascination with time and he developed a series of gimmick weapon and deathtrap based on time pieces (clocks with blades as hands, flying sun dials).
Chronos made his debut in Ivy Town, but was defeated by the Atom. He next tried to steal a collection of historic Hungarian clocks, but was again defeated. The Atom has since thwarted all of Chronos' plans. Each appearance or new crime prompted an evolution in Chronos' weaponry. His study of time led to more intricate and revolutionary inventions—lenses that prevent people from seeing certain events (e.g. his getaway vehicle or another specific object), circuitry embedded in his costume that could control the local flow of time (freezing people in time or altering his own perception of time), and ultimately a fully functional time machine (before it and the designs were destroyed). One story suggests that Chronos may have been receiving help from a future version of himself, but it is unknown at what relative time frame that Chronos came from. Another story, published in World's Finest Comics #321 (1985), suggests that Chronos made the transition from a mere thief with a time gimmick to a full-fledged time traveler after becoming acquainted with the mysterious Dr. Fox (perhaps named after Gardner Fox), a criminal scientist who had never been apprehended and who was described by Chronos as "the greatest mind since Einstein."
Chronos eventually stopped stealing for his own gain and began stealing to finance his time research. The Atom had always thwarted Chronos, but he had decided to turn his back on human and had retreated to a peace seclusion with a group of six-inch tall aliens in the Amazonian jungle. Chronos had more success without the Atom, but he brought himself to the attention of the Blue Beetle (Ted Kord) when he tried to blackmail one of the employee of Kord Inc. He also fought the Beetle during Darkseid's anti-hero riots. During one struggle against the Beetle, Chronos was hurled 100 million years into the past where he encountered a time-lost Captain Atom. He later met a time traveling Superman who Chronos manipulated into helping him get home.
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