For those fans that thought the Episode 3 - "Tell it to the Frogs" - was a real snoozer, than Episode 4, titled "Vatos", is for you, particularly with its destructive ending.
For me, I had no problem with Episode 3. As a avid reader of the comic book, it made sense to me to have Rick (Andrew Lincoln) head back into downtown Atlanta to save an angry hillbilly because that's precisely the kind of stupid decision the character's comic book version would do as well. Episode 4 sees Rick and the rescue crew find Merle's (Michael Rooker) hand, but no Merle, and then hit another speed bump when Glenn (Steven Yeun) is captured by a Mexican gang (hence the title).
Meanwhile, back at the survivor's camp, sisters Amy (Emma Bell) and Andrea (Laurie Holden) bond over family matters until the shit really hits the fan and zombies attack the campsite just as Rick, Glenn, T-Dog (IronE Singleton) and Daryl (Norman Reedus) return.
Comic boom creator Robert Kirkman wrote the episode, which combined his insightful look into human survival amongst an apocalypse with the surprising killing of a major character, something Kirkman implements into the comic book quite often, despite reader's complaints. The episode is the first not to be written whatsoever by Frank Darabont, and who better, and more merciless, than Kirkman?
For some reason I felt compelled to keep this recap spoiler-free, though I have no idea why anyone would read a recap before watching an episode or in lieu of watching one, but there you go. The video below, however, is NOT spoiler-free and provides some insight into the fourth episode.