Jim is joined by a former slave and a displaced Indian boy on his way to a Texas ranch where he becomes involved with a cattle drive to Dodge City. At the ranch he meets again Brian Harmon who also is a former astronaut whose mission was to go back in time to find Parker. Once he did, he decided to stay in that time period. Jim's nemesis is outlaw Mat Grover who wants revenge for Parker's involvement in the death of Mac's partner. On the Lewis and Clark expedition, Jim became acquainted with Sacagawea. Her early death on the Missouri was disputed by the Cheyenne, so Jim goes to the Wind River Reservation in search of truth.