The Flight Stuff

Snotlout becomes convinced he is dying having seen "The five signs of Valhalla", claiming that after seeing a singing tree, falling chickens, and sheep chasing him, etc, that he would die, and wants young Gustav to be his replacement including taking care of Hookfang in case he died. But when Snotlout "miraculously" recovers (the five signs he saw were really pranks played by Ruffnut and Tuffnut), he takes his dragon back, and Gustav decides to get a dragon of his own (named Fanghook) and join the academy… whether they want him to or not, especially as the Dragon Riders plan to stop Dagur the Deranged's new plan.