The mid-season finale of AMC's The Walking Dead capped the first half of Season 4 and posted gains of 29% over the first half of Season 3, running against NFL football, broadcast sweeps and high-profile special events. Last night's explosive episode delivered 12.1 million viewers and 7.7 million adults 18-49. The show will return for the second half of its fourth season at 9 p.m. on Sunday, February 9, followed by a new episode of Talking Dead at 10 p.m. Comic Book Men, which has been delivering 1 million viewers at midnight consistently across the first half of its third season, will also return to AMC on Sunday, February 9.

The Walking Dead continues to be the #1 show on all of television among the coveted 18-49 demographic and remains the highest-rated series in the history of cable television. The first eight episodes of its fourth season delivered an average of 13 million viewers and 8.4 million adults 18-49.

Here's what AMC president Charlie Collier had to say in a statement.

"We couldn't be happier that audiences are continuing to respond in ever-larger numbers to the outstanding work of this amazingly talented team. We're only at the mid-point of this fourth season, but I know I speak for the entire cast and crew in Atlanta when I say thank you to the fans for joining in our passion for these characters and their journey."

Now in its third season, The Walking Dead aftershow, Talking Dead, also is seeing strong gains in viewership. The mid-season finale of Talking Dead delivered a record 6 million viewers, including 3.8 million adults 18-49. For the first eight episodes of this season, airing at 10 p.m., Talking Dead is averaging 4.5 million viewers and 3 million adults 18-49. Up +128% in viewers over the first half of season two (when it aired at 11 p.m.), and up +120% among adults 18-49. Hosted by Chris Hardwick, Talking Dead features Hardwick and fans, actors, producers and other TV enthusiasts discussing and dissecting that night's Dead premiere. The mid-season finale episode featured cast members Scott Wilson (Hershel Greene), Lauren Cohan (Maggie Greene) and Robert Kirkman, executive producer of the show and creator and writer of The Walking Dead comic book.

Key Nielsen Highlights for the mid-season (Season 4) finale of The Walking Dead

  • 9 pm airing - 6.5 HH rating
  • 9 pm airing - 12.1 million viewers
  • 9 pm airing - 7.7 million adults 18-49

Key Nielsen Highlights (averages) for the first eight episodes of The Walking Dead Season 4

  • 9 pm airing - 6.8 HH rating
  • 9 pm airing - 13.0 million viewers
  • 9 pm airing - 8.4 million adults 18-49

Key Nielsen Highlights for the mid-season (Season 3) finale of Talking Dead

  • 10 pm airing - 3.2 HH rating
  • 10 pm airing - 6.0 million viewers
  • 10 pm airing - 3.8 million adults 18-49

Key Nielsen Highlights (averages) for the first eight episodes of Talking Dead Season 3

  • 10 pm airing - 2.4 HH rating
  • 10 pm airing - 4.5 million viewers
  • 10 pm airing - 3.0 million adults 18-49

Source: Nielsen Media Research fast nationals (US ratings) 12/1/13. Excludes sports programs. Growth Season 4A 10/13/13- 12/1/13 vs. 3A 10/14/12-12/2/12.

The mid-season finale of The Walking Dead also dominated TV-related social media Twitter activity, and was the #1 show of the night on Twitter across all cable and broadcast networks with 880,450 show-related Tweets from 391,210 unique authors, generating a total of 43.9 million impressions, according to Nielsen SocialGuide. Twitter activity peaked at 9:48 p.m. EST with 31,861 Tweets-per-minute, representing 83 percent of all television-related Twitter activity at that time. The Walking Dead was also the #1 program for the day in TV-related social media Twitter activity, including the mid-season finale and seven previous episodes that ran during a catch-up marathon on AMC, with the most unique authors and total Tweets. The mid-season finale also generated a number of simultaneous trending topics including #TheWalkingDead, TWD, Hershel, RIP Hershel, Not Hershel and #PrisonShowdown.