The Walking Dead 5.10: "Them" (2015) directed by Julius Ramsay
A little heavy-handed. The episode begins with the gang hungry and thirsty, tiredly walking down the highway. Behind them, a group of zombies follow. The symbolism is clear: there's hardly a difference between the two groups at this point. But, if you didn't get the message, later in the episode Rick helpfully calls the gang "the walking dead." Yes, he said the name of the series in an episode. C'mon.
There's also lots of talk in this episode about how they need to work together to make it through the end of the world. What happens later in the episode? They all have to work together to hold the barn doors shut against a horde of zombies. C'mon.