Phineas Bogg is a voyager who travels through history keeping it on the right track. After he lands in Jeffery Jones' bedroom and loses his guide to history, the two of them travel through time together fixing things that go wrong.
After saving Cleopatra, she inadvertently travels to the 1920's and helps out Lucky Luciano kidnap Babe Ruth. In 1919, Jeff and Phineas convinces the Babe 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 Jeffery 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 Jeffery 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 Jeffery 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 or no United States as well, Phineas and Jeffery return to the end of World War II to make sure that German rocket scientist Werner Van Braun doesn't far into Soviet hands.
In 1890 Jeffery can't call for a doctor when Dwight David Eisenhower's mother goes into labor because telephones don't exist. They travel to 1875 to make sure that Bell has his financing to continue his telephone experiments.