It was basically an advent calendar as a Minecraft series. For every day of Advent, there was an episode in which the adventurers (Martyn (InTheLittleWood), Toby (SoTotallyToby), Lewis (xILubez), and Henry (iBuze) in the first 2 series or Elliot (MegaGWolf) in the last two series) would do some task or activity; sometimes Christmas related, sometimes story related, and sometimes miscellaneous. There were 4 series, the first of which was more casual and had more survival Minecraft elements, though it still had a story and a pre-made map, and the other three were more traditional adventure maps (the 2nd and 3rd even being available for download!), which were made with help from a variety of teams, including the Noxcrew.

It's such a delight watching the adventurers interact, it's got such fun stories—especially in the latter 3 series where the stories were more fleshed out—and there's several fun characters, including:

Aunty Sandy, Martyn's aunt. Introduced in the first adventure as the owner of the house the four are staying in, though she didn't become a major character until the second series.

Uncle Stefano, Martyn's uncle and Sandy's husband. Introduced in the second adventure; he shares a strange resemblance to Noxite.

Christmas Spirit, an invisible player in a santa costume. Introduced in the second adventure; he helps the adventurers when they need guidance or face technical difficulties, and also just hangs out with them sometimes.

Hank and Marvin, a pair of iron golems. Introduced in the first adventure; they are a perfect example of humans' ability to project personalities onto unliving things.

And many more, including both original characters, altered versions of classic Christmas characters, and several cameos from other Minecraft youtubers!

This series has been a staple of my Christmas since 2011. I've watched it every year, and it never fails to delight me. It's honestly a big part of why I even got back into MCYT, since it was the only Minecraft series I had watched for many years, and when my sister told me about this new series called 3rd Life which Martyn was taking part in, I decided I'd check it out, and as a result I found many youtubers who I adore, and it's rekindled my love for Minecraft as a game, both to play and to watch. If I hadn't watched ACA every year, I'm not sure whether I would have been as interested in watching 3rd Life.

In any case, it's an absolutely delightful series, and I cannot recommend it enough to anyone who's a fan of InTheLittleWood.

If you're interested, here's the link to Martyn's playlist, which has each series and the trailers for them in order. Or, if you're like me and want to treat the series as an Advent calendar, I made a "live watching order" playlist, which has each series ordered based on the days. (As a note, the first series had some days that were combined, and in those cases I put those episodes in the second day's section (so, for example, Day 11/12 is with the other series' Day 12). Just in case you get to the 11th and wonder why the video from the first series was missing).