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.
Arriving in ancient Rome, Phineas and Jeffery must save the slave Spartacusso that he can lead the revolt in Capra. They also meet a young Sam Clemens and help Harriet Tubman escape.
Correcting history Phineas and Jeffery have to save a young Teddy Rossevelt from being killed by Billy the Kid and they assist Benjamin Franklin with his kite experiment.
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.
Pirates are everywhere as Phineas and Jeffery have save Jean Lafitte from a piracy charge and help General Andrew Jackson win the Battle of New Orleans.
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 with.
Jeffery and Phineas must save Annie Oakley who was performing in the Wild West Show in England, overt a Russian plot and prevent Queen Victoria's daughter from marrying a Russian nobleman.
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.
After finding Franklin D. Roosevelt directing movie pictures in Hollywood, the voyagers visit him just after he contracted polio to convince him to not give up and continue his career in politics.
Jeffery and Phineas must convince Joe Louis not to quit his rematch with Max Schmeling. They also save a doomed 747 aircraft that had future president Jimmy Carter on board.
In 1890 Jeffery can't call for a doctor when Dwight David Eisenhower's mother goes into labor because it doesn't exist. They travel to 1875 to make sure that Bell has is financing to continue his telephone experiments.
Through the efforts of the evil voyager Drake, Phineas is accused of being Jack the Ripper. To save him Jeffery recruits the help of reporter Nellie Bly and author Arthur Conan Doyle.