Ken Marino and Adam Scott of "Party Down."
Starz, a cable network best known for screening films, is branching into producing series -- and one of the most promising, Party Down, premieres at 8:30 p.m. tonight. The show is about a hapless bunch of starving actors fronting as caterers as they wait for their big break -- and Adam Scott, a familiar face thanks to movies like Step Brothers (he played Will Ferrell's younger bro), told me all about it in the following Q&A, conducted during his recent