As far as free expansions to free games go, The Dark Ages Part 1 was a pretty great addition to Plants vs Zombies 2 when it launched earlier this summer.

Of course, that “Part 1” moniker definitely kept us on our toes for a Part 2. Tomorrow, it looks like PopCap is going to deliver. At least on iOS. We don’t have an exact date for Android, but we can’t imagine it will be far behind.

While you’re waiting, here’s a quick behind-the-scenes demo of what you can expect when the update hits this week.