What happens when Ruffnut and Tuffnut find the Past Hiccup (From HTTYD 1) on the beach? Why is he here? Why can't he remember how he got here? How will present-day Hiccup react? (After HTTYD 2) How will past Hiccup react when he finds Berk overtaken by dragons, Astrid now in love with him, and his father no where to be found?