Well before her 20th birthday, Patty Duke had already won an Oscar and was star of her own TV series.
Patty Duke won the Oscar for best supporting actress in The 1962 movie The Miracle Worker, which was the captain from the Broadway play in which she also starred. 
On the heels of that success came her TV series, the Patty Duke Show, in which she played the dual roles of typical American teemager Patty and her identical cousin from England, Cathy.
Later Patty Duke moved on to more sophisticated, adult roles, including a part in the movie Valley of the Dolls.
But all along the way, she suffered from severe, undiagnosed bipolar disorder, Exacerbated by various forms of abuse.

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