While trying to take care of unfinished business, Hiccup and Toothless are lured into a trap. An unlikely rescuer comes to their aid.
A wounded Fireworm seeks the Dragon Riders' help in protecting a precious treasure trove against an unfamiliar creature with strange and slimy powers.
When things get out of hand while Fishlegs is left in charge, he seizes another chance to prove he has what it takes to be a leader.
Hiccup's and Snoutlout's fathers put aside their differences and work with their sons as a team to defend a storehouse against an unusual invader.
After Astrid makes an alarming discovery, her life comes to depend on a dragon everyone thought was extinct. Her pals race against time to find it.
Hiccup reluctantly allows the Dragon Riders to go to a deserted island for a much-needed vacation, but the getaway has an odd effect on their dragons.
After learning that Fishlegs has been secretly communicating with Heather, the gang invites her to the Edge to convince her to join the Dragon Riders.
When Hiccup and Toothless accidentally land in a Dragon Hunter trap, they find themselves the newest contestants in a gladiator-style arena.
Hiccup and his team rescue a dragon egg and bring it back to the Edge, where it hatches to reveal an ear-splitting surprise!.
The gang investigates why Viggo's men are mysteriously shipping marble blocks from a quarry. Next, they try to save two dragons being used as slaves.
When Dagur unexpectedly shows up, Hiccup scrambles to prevent him and Heather from discovering each other's presence.
Snotlout is sent on an undercover mission to Viggo's dragon auction as part of a plan to rescue the dragons and stop Viggo from getting richer.
When Viggo offers Hiccup a truce, the wary Dragon Riders investigate and find a potential ally in their fight against the Dragon Hunters.