ACTOR Walter Koenig, who played Chekov in the original Star Trek TV series, is getting into the comic book business. He's writing a three-issue series for Malibu Comics about Raver, the superhero alter ego of a character named Norman Walters of Grinnell, Iowa. Raver tries to save the universe from the perils of over-population.

ACCORDING to New York's Newsday, actor George C. Scott became incensed by the rude behaviour of a member of the audience during a matinee performance of Wrong Turn at Lungfish at the Promenade Theatre. It seems a woman stood up during the play and announced she was going to the bathroom. Upon her return, she declared loudly: ''I'm baaaaack.'' Scott stepped up to the edge of the stage during curtain calls and delivered a finger-wagging scolding.

A LONG-LOST song by Irving Berlin, written for a woman who is considered too tall for most men, has been rescued from oblivion by two-metre tall chanteuse Karen Akers. She is performing the song I'm Looking for a Daddy Long Legs at a Manhattan club. The singer got the tune from Berlin's daughter, Mary Ellin Barrett, who found it among other music.

ANDREW Lloyd Webber already has a musical version of Sunset Boulevard in the works, and soon a musical version of the 1973 film Paper Moon will be on stage. It will star Gregory Harrison of Trapper John MD , but the child role has not yet been cast.