Future Americans decide to time travel to 1776 to ask the founding fathers for the solutions to their problems. A glitch in the time machine changes their destination to 1976. Still believing themselves to be in 1776, the time travellers attempt to study this "ideal" civilization. 70's jokes, props and stars abound.
Former Nazi Klaus Abard survives to the 1990s by taking anti-aging pills. He plans to use a time travel trip to return to Germany in 1944 and present Hitler with a hydrogen bomb, so that he can win the war. Unfortunately the pilot, woman-chasing Karel Bures, dies on the morning of the trip and his earnest twin brother Jan impersonates him, without knowing about the plot. The plot goes wrong when they lose the bomb and land near Hitler's bunker in 1941, at a time that the Nazis sense victory.
Because of the time travel aspect, many episodes allude to famous people or incidents indirectly, such as Sam suggesting to young Donald Trump that New York real estate would be valuable in the future, suggesting the lyrics of "Peggy Sue" to a teenaged Buddy Holly, showing young Michael Jackson his signature moonwalk dance for the first time, giving Dr. Henry Heimlich the idea for his namesake maneuver by saving him from choking, and setting in place actions that lead to the discovery of the Watergate scandal.