Dreamers, start your ENGINES—the wildest crossover ever dreamed up has arrived! The LEGO® DREAMZzz world, Fast & Furious and How to Train Your Dragon are colliding head-on in the realm of Berk, with the Nightmare King’s seriously nightmarish plan: to UNtrain the dragons! The race to save the dream world drag-ON. Three epic worlds mash-up in one unexpected LEGO DREAMZzz adventure as How to Train Your Dragon and Fast & Furious meet in the dream world. What is more awesome, roaring dragons or roaring engines? After watching The Fast and the Furious and How to Train Your Dragon, our dream chasing friends put it to the test. They dream craft Fast & Furious cars and enter the dream world to race them against the dragons of Berk. BUT WAIT, the Nightmare King turns the friendly dragons savage, turning it into a nightmare. The dream chasers must join forces with dragon rider Hiccup in the wildest mash-up ever dreamed up. Can they save Toothless, the other dragons, and the dream realm?