'The Walking Dead' returns to jaw-dropping record rating

The Walking Dead has done it again.

Another. Another. Series-high rating.

Sunday night’s midseason return of the AMC zombie drama delivered 12.3 million viewers and a 6.1 adults 18-49 rating — its biggest yet in both measurements.

And that was against The Grammys.

To give you an idea of how stunning this performance is, ABC’s Once Upon a Time sank to a series low 2.2 in the demo last night and Fox’s Family Guy went down to a 2.4 — and those are the broadcast shows that performed the best against the music awards show.

Put another way: Last Thursday’s American Idol »