Invited by billionaire Miss Z to travel through time and photograph some of history's most important events, Luke, Isabel, David, and Julia are sent to the year 1863 to capture Abraham Lincoln delivering the Gettysburg Address.

Joe and his longtime enemy, Bobby Fuller, use a vintage baseball card to travel in time, hoping to stop Jim Thorpe from participating in the 1912 Olympics and losing his medals, but instead they watch Thorpe struggle during his first season with the New York Giants.

Stosh travels back to 1969 to try to prevent the untimely death of Roberto Clemente, a legendary baseball player and humanitarian, but upon his return to the present, he meets his own great-grandson who takes him into the future, and what he finds there is more shocking than anything he has encountered in his travels to the past.

When Stosh travels back in time to 1941 in hopes of preventing the Japanese attack on Pearl Harbor that brought the United States into World War II, he meets Ted Williams, one of the greatest hitters in baseball history.

With his ability to travel through time using baseball cards and photographs, thirteen-year-old Joe and his mother go back to 1863 to ask Abner Doubleday whether he invented baseball, but instead find themselves in the middle of the Battle of Gettysburg.