It has been three years since Frank, Hazel, Jason and Piper had died. Leo, Annabeth, and Percy had been working nonstop on a time machine to bring them back. It was the only way to keep Percy happy. Loyalty is his fatal flaw, as you all know. They all wouldn't stop until they finished it. They knew it was wrong, but still. More lives on the world, right?
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Hiccup and the Dragon Riders were doing fine on Berk. Hiccup was the chief, Fishlegs had lots of dragon knowledge, Snotlout finally impressed his dad, Ruffnut and Tuffnut were still doing their crazy Loki pranks, Astrid was one of the top warriors on Berk, and Astrid and Hiccup were dating. Translation: HICCSTRID!! Oh, I'm so happy. Uh... On with the story.
When they thought everything was perfect, something strange occurs...