Actor Charlie Sheen is suing National Enquirer and its parent company American Media for defamation, claiming the tabloid falsely asserted that he sodomized then-13-year-old Corey Haim decades ago.

"In my nearly 35 years as a celebrated entertainer, I have been nothing shy of a forthright, noble and valiant courier of the truth. Consistently admitting and owning a laundry list of shortcomings, wrongdoings and indiscretions this traveler hath traveled -- however, every man has a breaking point," Sheen told tmz.com.

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"These radically groundless and unfounded allegations end now. I now take a passionate stand against those who wish to even entertain the sick and twisted lies against me. Game over," he added.

According to the docs, obtained by TMZ, Sheen says the Enquirer article that ran on November 8 claimed Sheen sodomized Haim while they were filming the movie "Lucas" back in the 1980s. Sheen was 19 at the time.

The article blames Sheen for putting Haim on a path of drug abuse, which sent him to an early grave.

Sheen has publicly denied the story, and in the lawsuit he points out Haim's own mother has also denied it.