Chronos

Chronos is a temporal bounty hunter in the service of the Time Masters Council.

Biography
Chronos was sent by the Time Masters Council to bring Rip Hunter in after he commandeered The Waverider. He time travelled to 2016, just missing him. He instead killed two onlookers whom he deemed to not be integral to time. He then travelled back to 1975 where he found The Waverider, with only Jefferson Jackson inside. He began to try to damage and break in to it, but was intercepted by Rip, as well as Hawkman, Hawkgirl, Ray Palmer and Martin Stein. They were soon joined by Sara Lance, Leonard Snart and Mick Rory. Ray was able to run to the ship to retrieve his exo-suit, and likewise with Martin in order to bond with Jefferson as Firestorm. The Atom and Firestorm tried their best to fend off Chronos, before the team were able to time travel away to safety.