The comedy duo Planet Washington opens Cambridge Forum's 2009 fall season with a benefit performance. Ken Rynne, an alum of the renowned Capitol Steps troupe, and his faithful piano accompanist, Sean Collins, are Planet Washington. Together they provide an evening of music, song, and comedy improv that cuts through the rhetoric and gets to the laughter. If you sometimes think that "Inside the Beltway" seems like another planet, this show is for you!