AMC is upping the ante with "The Walking Dead."

The network announced that episode four of season six will be 90 minutes long! They're referring to it as "The Walking Dead" Mega Sunday. The episode, titled "Here's Not Here" and written by showrunner Scott M. Gimple, will test the loyalties and trustworthiness of our main characters.

It's possible that this could be the long-hyped flashback episode Gimple teased way back at San Diego Comic Con. If so, fans may be treated to some pre-apocalypse content which would be an interesting change of pace.

In addition to the 90 minutes full of zombie killing goodness, AMC will also air the world premiere of the trailer for the upcoming comic book adaptation series "Preacher," as well as a new trailer for "Into the Badlands."

"The Walking Dead" airs Sunday at 9 .m. EDT on AMC.