This special episode digs into its archives and features highlights throughout the seasons including triumphs and tragedies, delightful discoveries and sobering moments. It also unveils outtakes and never-before-seen footage from the "Who Do" vault.

Television personality Tom Bergeron researches his paternal roots in France and discovers his nine-times great grandmother, Marguerite, who endured upheaval and faced going against her Protestant upbringing in order to survive.