Actor and director Simon Baker learns about a legacy left by his three-times great grandfather, and the substantial courage and fortitude of his female ancestors.

Actor David Wenham rose to fame as ‘Diver Dan’ in the long-running TV series SeaChange. He has inhabited countless characters in a 30-year career spanning theatre, TV and film but the characters in David’s own bloodline remain largely unknown to him.

Actor, former self-described 'serial pest', and member of the Stolen Generation, Uncle Jack Charles has never known the love of a parent. He will uncover details of the father he never knew.

Singer Tina Arena has always wanted to find out more about where her Italian-born parents came from, a subject that has never really been talked about in her family. She is driven to find out the truth behind some family secrets and heads off to Sicily to explore her Italian roots and the tough reality of her grandparents’ childhoods.

Amanda Keller finds out that her bloodline has survived against all odds as she discovers that an ancestor faced hell on earth in Australia‟s most brutal prison and a mother who saved her family in the face of tragedy.

Jeff Fatt, famous as the Purple Wiggle, knows his Chinese roots go back four generations into Australia's history, but he wants details of why those ancestors came to Australia.

Internationally celebrated actor Geoffrey Rush believes he hails from a long line of farmers but an exploration of his heritage sees him discover an ancestor fighting for justice in the face of corruption and another desperate to succeed in a golden age of creativity.

Sporting legend Dawn Fraser is a hands-on grandmother who wants to know more about her own grandparents. This Aussie icon discovers she has South American heritage.

Having always struggled to understand culturally who he is, renowned neurosurgeon Charlie Teo is looking for answers. Exploring his mother’s side of the family, Charlie’s journey will take him to Malacca, where he discovers a culture he’s never heard of, but one with which he can now clearly identify. On his father’s side, Charlie comes face to face with his paternal ancestors. Will he be able to mend his connection with this side of his family and finally be proud of his Teo heritage?

Rebecca Gibney attempts to find out more about her past and travels to New Zealand. The journey takes her from Parihaka to Wellington to Auckland, where she learns some shocking truths about her family history.

Iconic entertainer Greig Pickhaver, known for his comedic alter ego HG Nelson, investigates the leading characters in his family history. His search uncovers a great-grandfather, Samuel Rinder, who in the late 19th century, made his fortune as a sheep trader during Bendigo’s boom years. As a wealthy man about town, Rinder spent much of his time and money down at the racetrack, but when economic recession loomed, he turned to crime.

Actor Toni Collette delves into the enigma of her grandparents and uncovers a tale of abandonment and tragedy, a secret wartime affair, and an unexpected ancestor. A DNA test serves only to deepen the mystery.

Successful Chef and Restaurateur, Luke Nguyen discovers his Grandfather had a wife and child in China, who he left behind, when he migrated to Vietnam and began a second family. Luke searches a remote corner of China to bring this long lost family back into the fold. He then travels to Vietnam and looks into the troubled history of his parents’ homeland, searching for clues to explain his own painful past.

When Celia Pacquola digs into her beloved mum's family, she finds her three times Scottish great grandfather, John Rae, was Sydney's first Town Clerk.

A generation ago Andrew Denton’s family anglicised their name from Ditkofsky to Denton, in an effort to keep members safe at a time of entrenched racial intolerance. Andrew now attempts to find out more about his family's past.

When Former Prime Minister Malcolm Turnbull opens the book on his family history, curiosity turns to fascination when he discovers a mysterious unclaimed fortune.

Adam Goodes learns more about his aboriginal heritage, journeying into the remote Flinders Ranges finding evidence of his ancestors from thousands of years ago.

Natalie Imbruglia has always taken pride in her father’s Italian ancestry, but she knows very little regarding her mother’s Australian heritage. Although family folklore points to strong-willed and independent women on this side of the family, Natalie wants to know more about these women and their stories. This journey will allow Natalie to finally connect with her Australian ancestry dating all the way back to the beginnings of the colony.

Jack Thompson looms large in the Australian imagination from such iconic films as Breaker Morant and The Man from Snowy River. Born John Hadley Pain in Sydney in 1940, he knows very little about the history of his biological family. When his mother died, Jack was sent to a local boarding school as their father Harold was unable to look after them. Eventually Jack was adopted by the Thompson family and he took their name. For the first time, Jack Thompson, legend of the Australian screen, discovers the history of his biological relations and the importance of us knowing our own stories.

Kate Ceberano made her name as a pop princess in the 1980s. She has sustained her singing career since then, touring for the past 20 years. Recently she has plunged back into the national limelight as winner of the 2007 series Dancing with the Stars. Turning 40 years old has become a watershed in her life. Kate wants to stop her hectic schedule and look back for a moment and find out more about her family’s past. Whilst looking Asian - her Hawaiian born father is third-generation Filipina - Kate has always felt Anglo and yet knows little about this side of her heritage. She starts to understand why she is who she is, and answer many mysteries that she’s been longing to find an answer for.

Geoffrey Robertson is one of Australia’s best-known expatriates. The UK-based human rights advocate and occasional Hypotheticals presenter has been mixing with the famous and infamous ever since he exploded onto the swinging sixties scene to help defend the Oz magazine obscenity case. "People often come up to me and say 'Oh you Australians are so refreshing.' What they mean is 'Rack-off you loud-mouthed colonial.'" He is the consummate self-made man and his razor-sharp legal mind gives short-shrift to the nature-nurture debate. Genes don’t fit his world view. But when he starts looking into his family tree in Who Do You Think You Are?® he finds some remarkable parallels in the expatriate lives of his forebears. Is Geoffrey Robertson the descendant of a right royal bastard or a very wiley entrepreneur? The jury is still out.

Catherine Freeman represented her people and her country as an athlete and, on the most memorable night in Australian sporting history, won a gold medal at the Sydney 2000 Olympic Games. In her own words, she “runned fast”. Earlier, she’d lit the Olympic Flame in the Opening Ceremony, making her the first person to light the Olympic flame and win a gold medal at the same games. Catherine believes that your make-up is a product of the past, so it’s natural for her to want to find out about her ancestors. She’s interested in finding out from where she inherited her athletic ability. Catherine also believes you inherit your emotions and psychology from your ancestors and she’s extremely curious to discover what aspects of her innate nature are also inherited. She hopes that learning about her ancestors will make her feel more at ease with who she is, and stronger going into the future.

Dennis Cometti is the best known and most authoritative Australian Rules football commentator in Australia. Millions of football fans around the nation admire and respect his droll, quirky commentary. He knows everything there is to know about the genealogy of the AFL, confidently recalling any player’s pedigree, background and performance statistics – he spends hours researching the history of the game. But ask the ‘footy statistic guru’ about his own family and it is an entirely different story. He claims he has never had time to look into his own history. Dennis wants to reconnect with his Italian identity. Everyone else identifies with him being Italian and he’s bemused because he doesn’t - he can’t even speak the language. Who Do You Think You Are?® takes Dennis on a journey to explore his rich Italian heritage.

Ita Buttrose is a trail-blazer – the first female editor of a major newspaper in Australia, a publisher, broadcaster and campaigner of equal opportunity for women. She’s promoted health issues, the needs of family and Australia’s ageing population. She’s always had a passionate interest in her family’s history, particularly in trying to unravel why her family changed their name from Butters to Buttrose, but has never had the time to investigate. Driven by the fact that many of her immediate family have creative and “nomadic” lives, she’s curious to find out whether these are ancestral traits. Ita was made an Officer of the Order of Australia in 1988.

Footy legend and latter day ‘Knight in Shining Armour’ Ron Barassi has always believed that actions speak louder than words. He embarks on a journey into his ancestry tracing the Barassi family line back to the Victorian Gold Rush and discovers a heart-rending tale of violence, tragedy and redemption.