Rip Hunter was an ordinary man who used his Time-Sphere to travel through time. Aided by his friend Jeff Smith, girlfriend Bonnie Baxter, and Bonnie's kid brother Corky, they had many adventures in time.
Determined to find a link to the alternate realities and timelines he had experienced in the Pre-Crisis universe, Hunter began recklessly traveling back and forth through time, seeking a break in the barrier that sealed this universe from all the others. His travels drew the attention of the Linear Men, a team of time cops from the future, charged with the preservation of the integrity of the timestream.
Now with white hair and bionic implants (to protect him from the stress of time travel), Hunter observed the timestream along with the other Linear Men. He appeared to take up their mission, interfering with outside events only when necessary to prevent changes to the timestream (most notably during the Zero Hour event)