Sean has a video game called LEGO Dimensions. You buy character packs, build them out of LEGO, and then you can play them in the game. The character packs come in all sorts of cool recognizable shapes and sizes: Sean has the Simpsons, and Back to the Future, and Ghostbusters, for example. He builds a Marty McFly, and a Delorean, and then he can go through the plot of the movie using those characters. It’s pretty cool. But as a completionist, he’s also bought character packs that we have no experience with at all, like Harry Potter, Adventure Time, Portal 2, and Ninjago. And while we knew that Harry Potter were popular books, and a franchise of films, we didn’t know Ninjago at all. In fact, we didn’t even know how to pronounce it correctly until Sean called it Ninja-go in front of his 4 year old nephew, who looked at him like he was a complete sack of shit. It’s pronounced Nin-jaw-go, for your information. And apparently it’s a TV show used to sell LEGO sets. But whereas Bill Murray was a real flesh and blood person rendered into a cartoon version of a LEGO mini figure, the Ninjagos were always LEGO. LEGO has sold over 100 different sets of LEGOs based on that show, so you can see how it’s a big money maker for them. The movie is a cog in their money making machine.

The gist of the movie: Garmadon (Justin Theroux) is the bad guy threatening the world of Ninjago. But every time he tries to invade it for good, he’s thwarted by a band of teenage ninjas trained by his brother, Master Wu (Jackie Chan) and led by the son he abandoned 16 years ago, Lloyd (Dave Franco) though none bear any familial resemblance. Being the son of a noted bad guy is hard, and so is being the vaguely named “green ninja” in a crew of ninjas otherwise named for the elements – Cole\Earth (Fred Armisen), Jay\Lightning (Kumail Nanjiani), Kai\Fire (Michael Pena), Zane\Ice (Zach Woods), and Nya\Water (Abbi Jacobson). They get to ride around in really cool LEGO robots that can shoot things and fly, and I can totally see the toy appeal. Lloyd’s robot vehicle is a dragon that shoots missiles from every body part imaginable – what kid could resist? But the genius is that that they all have something different, so the potential for you to spend money is almost limitless.

Anyway, when Garmadon makes his most successful bid to capture the city (and a monster threatens to destroy it), Lloyd will have to learn now to harness his vague ninja powers, pull his team together, and also bond a little with his bad guy dad.

Yes, it’s all a big ploy to get into your wallet. But like the other LEGO movies that came before it, it’s also shamelessly fun. But this one is the weakest of the three, in part because it only appeals to the kids who know and watch the show. The other two movies preyed on adult nostalgia and reminded them of the toys they played with as kids. The only thing this movie might remind you of is the sharp little buggers that get lost in your carpet and hurt like hell when you step on them at night on your way to the bathroom. LEGO knows what it’s doing: the butt joke ratio is extremely high, and the kids laugh every damn time. So go ahead and take them to it, as long as you understand that it’s likely to cost you more than just the movie tickets.