Under the pact, he will create a series, his first solo creation in almost a decade. He also will shepherd comedy and drama projects from other writers.
"They say you can never go home again, but with this deal at HBO, I feel I am," Star said. "I can say from my fortunate experience that there is nothing in the world quite like having a series on HBO."
Star's experience at HBO was mostly with the network's previous regime -- on "Sex" and on Star's most recent project there, "Diary of a Manhattan Call Girl," which was put in development by Chris Albrecht, who left his post as chairman and CEO in 2007. But Star said he already has developed great rapport with HBO's new programing executives.
In addition to the Emmy-winning "Sex," Star's series creator credits include Fox's "Beverly Hills, 90210" and its spinoff, "Melrose Place" -- both enjoying a second life with their CW updates -- as well as the critically praised WB comedy "Grosse Pointe."