As Stalin's purges and arrests increase, Sasha and his mother plan to leave Russia to join his father and older sister who have emigrated to Riga, Latvia.
David travels back in time to 1906 San Francisco to try to save the lives of Antonio Giovanni and his family who were victims of the devastating earthquake.
David and his family travel back in time to San Antonio, Texas in 1836 and meet brave defenders of the Alamo such as Davy Crockett.
The Smithers family find Grandpa's old time machine and decide to travel back to 1880 for their summer vacation. David and Jenny learn a lot about their heritage and history on their incredible trip.
While studying migrant farm workers of the 1960's, Kenneth and Aleesa travel back in time and meet Cesar Chavez during the farmworkers' strike for fair treatment and better pay. Can they protect Chavez and his dream for his people from sabotage?
Sasha tries to adjust to his new life in the United States, but his thoughts keep returning to the deepening troubles in his home country, Latvia, as Hitler's bombs fall on Riga in June of 1941.
Transported accidentally back in time to a college campus in the South in 1931, Kenneth and Aleesa meet the young Langston Hughes on his poetry-reading tour and confront racism and threats to Hughes first-hand. What do they discover about the real power behind his words?