Hollywood superstar Leonardo Dicaprio plans to star as Timothy Leary in the first biopic of the 1960s counter-culture icon. The forthcoming project, which is being developed by DiCaprio's production company Appian Way, will be based on a script by Leary historian MICHAEL HOROWITZ and The Secret Lives of Dentists writer Craig Lucas. DiCaprio's father, comic book writer GEORGE DiCAPRIO, was a friend of Harvard University professor and LSD pioneer Leary, who died in 1996. The movie is currently untitled, writes website EmpireOnline.com.