As previously hinted, Bob Newhart has been cast opposite "Thong Song" rapper Sisq&#243 in an upcoming NBC sitcom. The as-yet-untitled comedy has a show-within-a-show premise: Sisq&#243 will play a blue-collar Baltimore man who gets fame and his own TV series after performing a heroic act. Newhart is to portray the TV icon who takes the newbie under his wing.