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.

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.

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.

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.

Singer-songwriter Delta Goodrem has searched for the creative connection in her ancestry - some link that would explain her own abilities. Her infectious curiosity is rewarded by the intricate adventures of her great grandmother, an enigmatic woman whose life took some unexpected twists and turns. As family secrets are revealed, Delta unveils her spirited great grandmother's passions in marvellous Melbourne.

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.

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.

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.

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.

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.

Australian film and TV industry luminary, actress Sigrid Thornton has cornered the market in feisty leading roles. Tonight she embarks on a journey into her ancestry uncovering a genetic tendency to get into trouble with the law.

Bad boy larrikin actor Ben Mendelsohn embarks on a journey into his ancestry to find out if he really is related to the famous composer of the Wedding March - Felix Mendelssohn. He traces the Mendelsohn family line back to the heart of Europe and discovers a thread of musical heritage in surprising quarters as well as a heart-rending tale of success, failure and heartbreak of Dickensian proportions.

Singer Christine Anu's ancestry is from the Torres Straits Islands. She’d like to understand why music is so important in her life. Her journey takes her not only to the Torres Straits but to England where she discovers a heritage of music and culture, beyond her wildest dreams.

Celebrity “Country Cook" Maggie Beer is probably best known for being half of the TV duo The Cook and The Chef, as well as for her famous Pheasant Farm Pate. Tonight she embarks on a journey into her ancestry discovering a convict bigamist with a penchant for very tall tales.

Rock star and activist John Butler is searching for his heritage hoping to find poets, musicians and revolutionaries. In his WDYTYA journey John traces the Butler name back through generations of hardship to a matriarch who sang for her survival. Then he follows his Bulgarian ancestry to the mountain town of Koprivshtitsa and to an ancestor caught up in a violent revolt, central to the birth of a nation.

Magda Szubanski is the actor behind many of Australia’s most loved comic characters. Magda has always been a fearless performer. But where is that courage from? To better understand how world events have shaped her family, Magda will trace the lives of two ancestors. Both were forced to make grim choices and both were forced to confront with the brutality of war.

Cricketer Rod Marsh trawls the records, to overturn long-held secrets and piece together the dramatic circumstances that led to his father’s adoption. For the first time he discovers who his biological grandparents are and why their children were given up for adoption.

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.

Actor and comedian is probably best known for his roles in City Homicide and Thank God You’re Here. In this series he investigates a pattern of absent fathers and discovers a man with grand but fraudulent designs.