When CBS pitted its irresistible force (Survivor) against NBC's immovable object (Friends), the Thursday-night collision threatened the very fabric of the space-time continuum. For now, VCR-equipped viewers have found room for both near the top of the ratings. Still, for the first time in years, NBC's slogan, "Must-See TV," no longer sounds like a binding command. Airing after Survivor, CBS's CSI catapulted from No. 19 to No. 4 in the ratings in its first week in the new time slot.
This week CBS takes the battle to the biggest target of all. ER is America's reigning No. 1 series, but partly...