I've thought about a prequel episode for a bit, and just thought it would be cool to maybe switch perspectives from the beginning and play as Carley, Doug, and/or maybe Lilly before the invasion.
This way, we can actually experience what happened leading up to Lee/Clem/Kenny's family arriving at the drug store and with the episode ending with Carley shooting the zombie on Duck and the family running inside for safety.
It's not a real major, huge deal, it's just a cool thought. Also I want more on Mark... he deserved more than what he got in episode 2, but that's a discussion for another day. Lol.