Episodes: Series - Dragons: Race to the Edge - 2015

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When Dagur the Deranged breaks out of prison, Hiccup and his friends soon come to learn that he has access to treasures that could enable him to make a comeback.

A rescue mission leads Hiccup to a discovery that might hold the answer to the mysteries of the Dragon Eye, though it leads them to seek out a fearsome dragon.

As they look for a base of operations, the dragon riders end up on an island inhabited by a fearsome dragon, leaving it up to Hiccup to come up with a plan to save his friends.

As the riders select an island as their base, they soon learn that the island is the home to a new dragon species that seem to be hiding a major secret.

After suffering from a mysterious allergy, Fishlegs seeks treatment from Gothi, which ends up backfiring as he is hypnotized into thinking himself a mighty warrior.

As Gustav's hopes of training with the dragon riders are shattered, he receives a tempting offer after being kidnapped by Dagur the Deranged.

As Ruffnut and Tuffnut try to enforce their authority after learning that they own the island, they have to contend with another threat as Fireworm dragons threaten to destroy the island.

With Dragon's Edge plagued by a rampant Rumblehorn, Hiccup is forced to join forces with a much-changed Stoick to figure out what's driving the Rumblehorn into such erratic actions.

When the Gronckles are driven out of their ancestral home island, Fishlegs resorts to drastic measures in an attempt to secure their return to their island.

When they investigate the news about a rogue bounty hunter, the dragon riders end up reuniting with a familiar face, only for their uneasy alliance to reveal a hidden agenda.

As Hiccup tries to convince Heather to let go of her plans for revenge, she reveals some details that lead him to a shocking discovery about her origins.

When the riders come across an injured baby dragon, they discover some things that differentiate him from the rest of his pack as they try to treat him and reunite him with his pack.

When Hookfang mates with another dragon, Snotlout battles doubts about his own bond with the dragon, only to discover that there is more to Hookfang's bond with the female dragon than what meets the eye.