For once the description is actually accurate for the episode and not hiding any type of major plot spoiler for what is really happening. The whole episode is about Steven working to get the two new members of the Crystal Gems, Peridot and Lapis Lazuli to get along. This isn’t an easy task as the last time the two hung out, Peridot dragged her back to Earth against her will to use her as an informant against Steven and the team. Ah, reformed villains, they always have so much baggage to deal with.
From there it’s more of a comedy episode as the two Gems work to try and get alone. Actually, Peridot works to get along and Lapis just gives her the cold shoulder. Steven suggestions the use of sitcom plans to fix the problem such as drawing a line down the barn and putting up a curtain. These don’t work as Peridot is awkward when it comes to people so trying to connect with someone she’s wronged doesn’t exactly work. Apologies are not her strong suit. It’s interesting though, when it’s all over, they aren’t friends. Lapis is still bitter but she seems to be less so. So basically the pair don’t really get along but will be working on it for the rest of the season.
The ending is a bigger cliffhanger than the previous episode Same Old World. You’ll have to watch for yourself to see what happens but fans will definitely be eager for the next episode to come out. For now, Barn Mates is enjoyable and you should watch it for yourself to see these two Gems trying to get along in barn they now call home.