Phineas Bogg is a Voyager who travels through time keeping it on the right track. After he lands in Jeffrey Jones' bedroom and loses his guide to history, the two of them travel through time together fixing things that go wrong.
Cleopatra inadvertently travels to New York City in 1927 and helps out Lucky Luciano kidnap Babe Ruth. In 1919, Jeff and Phineas convince Babe Ruth to give up pitching and become the home run hitting champion he is more famous for.
After finding the South winning the Civil War, Phineas and Jeffrey must prevent the kidnapping of Abraham Lincoln. They also encounter a young Charles Dickens who has trouble with the real Fagin and Artful Dodger when the Omni is stolen.
Phineas and Jeffrey come across a legendary Voyager who wants to finish his retirement on a Pacific Island. After they help Marco Polo, they must save the elderly Voyager for he is on Bikini Atoll just before a nuclear test.
Phineas and Jeffrey convince George Washington not the join the British during the American Revolution and steal back his plans from a British officer for attacking Trenton in 1776. While helping out American labor leader Samuel Gompers, they meet an ancestor of Jeffery with whom Phineas wants him to live.
Phineas and Jeff save General MacArthur's life during the attack on Pearl Harbor and help Buffalo Bill Cody make his Pony Express run. They must also deal with an Army intelligence officer who travels in time with them.
After finding no Cape Kennedy in 1969 and no United States either, Phineas and Jeffrey return to the end of World War II to make sure that German rocket scientist Werner von Braun doesn't fall into Soviet hands.
In 1890, Jeffrey can't call for a doctor when Dwight D. Eisenhower's mother goes into labor because telephones don't exist. They travel to 1875 to make sure that Alexander Graham Bell has his financing to continue his telephone experiments.