It had to happen sooner or later: NBC plans to pull the plug on the struggling sitcom The Michael Richards Show after three more episodes. Richards, who enjoyed enormous success as Seinfeld's Kramer, simply couldn't hold audiences with his goofy turn as bumbling private detective Vic Nardozza. Mid-season replacement Three Sisters — an ensemble comedy featuring Dyan Cannon — joins NBC's revamped Tuesday lineup in the slot starting on Jan. 9.