The Voyagers appear in 1890 Texas and find that Dwight Eisenhower's mother is unable to give birth to him because of the absence of a doctor. They travel to 1875 Boston to insure that Alexander Graham Bell gets the necessary funding to invent the telephone.
First, the Voyagers help Albert Schweitzer in his efforts to bring medical aid to a dying African tribal chief. Then they arrive in 1887 to help Annie Oakley, who is with Buffalo Bill's circus that is in England to perform for Queen Victoria.
Jeff and Bogg arrive in 1930's New York and meet a retired adventurer/voyager, Isaac Wolfstein.
Arriving in Italy in 73 B.C., the pair discover that Spartacus is being sent to die in the arena in Rome, altering history and preventing him for leading the slave revolt in Capua.