Primetime Ratings: 'Survivor: Heroes vs. Villains' Premieres Up; 'Grey's Anatomy' Hits Lows

CBS easily won Thursday with overall viewers and adults 18-49 with the two hour premiere of Survivor: Heroes vs. Villains and an hour of The Mentalist.

ABC was second on a night where Grey's Anatomy saw its lowest adults 18-49 ratings ever for an original episode.

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