In the past two decades, Lego has aggressively expanded its line of building kits with numerous commercial tie-ins, such as Harry Potter and Star Wars (more on those in a minute). Ninjago, an animated TV series about six teenage ninjas and the hero-starved world they live in, is Lego’s own creation, with dozens of building kits available. The City Gardens set is one of the newest — and biggest — Ninjago kits to date.