After barely escaping an explosion at Mason Industries, Wyatt and Rufus chase the Mothership back to a French battlefront during World War 1 to rescue Lucy from Rittenhouse. There, they discover that Lucy has recruited Marie Curie, the famous French scientist and the only person ever to win two Nobel Prizes, to help save the life of a wounded American soldier, only to learn that the soldier is Lucy’s own great-grandfather who Rittenhouse is bringing to the present to be their leader.

The Time Team chases Rittenhouse to a stock car race in the 1950s where Wyatt learns that his favorite race car driver is actually a Rittenhouse sleeper agent on a mission to destroy the American car industry. To stop the Rittenhouse plan, Wyatt, Lucy and Rufus team up with Wendell Scott, the first African-American NASCAR driver.

When a Rittenhouse sleeper agent in 1941 Hollywood steals the only copy of Citizen Kane, Lucy, Wyatt and Rufus team up with Hedy Lamarr to get it back. Hedy Lamarr turns out to be not only a glamorous movie star but also a scientific wizard whose discoveries led to the invention of Wi-Fi.

While Wyatt sneaks away from the bunker to face an unbelievable truth, Lucy, Rufus and their former enemy-turned- teammate, Garcia Flynn, chase the Mothership to the Salem Witch Trials. There they must prevent the execution of a headstrong young woman who, it turns out, is mother to one of the most consequential Americans of all time – the yet to be born Benjamin Franklin. When Lucy is accused of being a witch, the team rallies together not only to save Abiah and Lucy, but all the accused women.

When a mission goes awry, Wyatt and Rufus are forced to bring a 17-year-old John F. Kennedy with them to the present. Anxious to return the future president to history, the team must find a way to work together to rescue JFK and return him to the past before Rittenhouse assassinates him in 2018.

When Rufus and Jiya add a fourth seat to the Lifeboat, for the first time ever, Connor Mason joins the team as they travel back to the dusty backroads and smoky juke joints of the Depression-era South to rescue the life and legacy of Robert Johnson – King of the Delta Blues, Godfather of Rock n’ Roll and a man who, legend has it, bought his musical genius from the Devil for the price of his soul. Meanwhile, Agent Christopher keeps Wyatt in the present to execute a dangerous raid on Rittenhouse headquarters.