Who Do You Think You Are?

Mandy Moore is given the opportunity to research her family tree.

Jessica Biel hunts for the truth behind family lore about the death of an ancestor, and also makes two shocking discoveries that shake everything she knows about her heritage.

Actress Liv Tyler unravels the mystery of her father Steven Tyler's maternal family line, uncovering ancestors who took part in famous American battles.

Actress Hilary Duff uncovers the tale of an ancestor who bravely led an American colony to battle a notorious gang of pirates; she dives centuries-deep into her Scottish roots and is shocked to discover that she descends from a heroic medieval king.

Actor Sean Hayes searches his paternal ancestry for answers to his estranged father's troubled past and discovers a trail of tragedy and crime.

Actress Rachel McAdams finds harrowing circumstances in her Canadian ancestry; connecting with relatives uprooted by war; discovering an English ancestor in a privileged world.

Actor Jim Parsons explores his paternal ancestry; Jim's journey takes him to Louisiana and France where he discovers his forefathers who made a mark in history.

Actress Hilary Duff uncovers the tale of an ancestor who bravely led an American colony to battle a notorious gang of pirates; she dives centuries-deep into her Scottish roots and is shocked to discover that she descends from a heroic medieval king.

Mandy Moore is given the opportunity to research her family tree.

Actress Rachel McAdams finds harrowing circumstances in her Canadian ancestry; connecting with relatives uprooted by war; discovering an English ancestor in a privileged world.

Actor Sean Hayes searches his paternal ancestry for answers to his estranged father's troubled past and discovers a trail of tragedy and crime.

Actor Jim Parsons explores his paternal ancestry; Jim's journey takes him to Louisiana and France where he discovers his forefathers who made a mark in history.