By Gary Levin Premiere-week highlights: *Monday. New CBS sitcom Worst Week opens to a good 10.9million viewers but trails last year's Rules of Engagement, despite a stronger Two and a Half Men lead-in. Heroes (10.1 million) is down 28% from last fall's opener. *Tuesday.

Oscar-winning actress Olympia Dukakis has agreed to guest star on the new U.S. sit-com "Worst Week," CBS announced Monday.

By DALE McGARRIGLE; OF THE NEWS STAFF Brave CBS. Now there's two words not often put together. The eye is leading off a second night with sitcoms at a time when network comedy is supposedly dead.

By GREG BRAXTON By Greg Braxton Los Angeles Times HOLLYWOOD THE SUCCESS of CBS' new comedy "Worst Week" might rise or fall largely on viewers laughing at the main character of Sam Briggs, who is subjected each week to a torrent of comedic catastrophes.

It's the job of network-TV executives to put a happy face on vexing situations. So, when an executive sounds an alarm, you'd better pay attention.