Chronos (DCAU)
From Pop-Cult Guides
Chronos is a DC Comics supervillain who takes his name from the Greek personification of Time and has the ability to time travel and manipulate history.
A version of the character appeared in the Justice League Unlimited animated series in the two-part episode "The Once and Future Thing". He was voiced by Peter MacNicol. In this incarnation, David Clinton is a man from the future (or rather, from the time of Batman Beyond). He was a small, meek physics professor who was ostracized by his peers for his theories on time travel. However, Clinton had secretly perfected a time-travelling device. Aware of the problems of time paradoxes, he tried not to use his device to do anything that would adversely affect the timestream; instead, he began collecting items from the past at the points when they would no longer be missed.
Eventually, the incessant hectoring from his wife Enid (played by Mindy Sterling) forced Clinton to retreat to the past. After failing to steal Batman's utility belt, he attracted the attention of Batman, Wonder Woman, and Green Lantern, accidentally pulling them into the Old West. Clinton's time belt was stolen by a local villain named Tobias Manning, so Clinton helped the heroes defeat him after they sprung him from Manning's prison.
Once free, the power-hungry Clinton retreated to the timestream to make himself, "the undisputed master of space and time", and adopted the Chronos identity. The three Leaguers followed him to the Batman Beyond timeline, only to find the world bizarrely altered (with the Titanic and the Leaning Tower of Pisa alongside Gotham's architecture, amongst other things). Chronos' irresponsible actions had started making time collapse. Batman and Green Lantern teamed up with the remaining roster of the Justice League Unlimited: (Warhawk, Static, Batman (Terry McGinnis) and the future version of Bruce Wayne. They forced the now-fearful Enid to tell them where Clinton was - in the jail from the Old West that Clinton had brought to the future, where he slept every night. (Presumably, this is because his six months in the jail cell were a vacation away from his nagging wife, and therefore far more comfortable to him.)
After a fearful battle with much life lost, Green Lantern and Batman chase Chronos into the timestream. Chronos' final intended act would be to return to the beginning of time, and therefore become a god. The heroes catch up with him, and Batman inserted a disc into Chronos' belt that somehow reversed everything that happened. Green Lantern, Batman, and Wonder Woman returned to the present day; Clinton himself became permanently trapped in his argument with Enid, looping over and over for all eternity.
