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.
When Hiccup and Toothless accidentally land in a Dragon Hunter trap, they find themselves the newest contestants in a gladiator-style arena.
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.
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 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.
Hiccup and his team rescue a dragon egg and bring it back to the Edge, where it hatches to reveal an ear-splitting surprise
Joe Jonas demonstrates his unusual cellphone replacement; Scott arranges a memorial service for an old friend; Maxwell Keeper discusses his workplace; and a sneak peek at Scott's movie.
The intrigue intensifies in town as Anderson uncovers startling news about someone close to him. Megan holds fast to her secret.
While trying to take care of unfinished business, Hiccup and Toothless are lured into a trap. An unlikely rescuer comes to their aid.
Nathan Fielder makes and appearance; Scott and "Weird Al" try their best to freak out Nathan Fielder.
A treachery is revealed. Wynonna prepares for her final showdown with Bobo.
'Student Debt' - Americans owe $1.3 trillion in student loans --second only to home mortgages. The rise in student loan borrowing is tied to skyrocketing tuition rates, which are up 226% since 1980. VICE reports from America's college campuses to explore how a spigot of easy money from the federal government is jacking up the cost of higher education and even threatening our international competitiveness. 'Fecal Medicine' - For years, medical science was powerless against one of the most of severe intestinal infections. But a new treatment shows tremendous promise -- if patients aren't too squeamish to try it. Fecal transplants use the stool from a healthy person to repopulate life-sustaining bacteria in the colon of the patient. This technique is so effective that researchers are testing its potential to treat disorders far beyond the digestive tract, pointing to breakthrough treatments for a broad range of the most stubborn diseases. VICE reports from the labs and lavatories where this medical revolution is taking place.
When Viggo offers Hiccup a truce, the wary Dragon Riders investigate and find a potential ally in their fight against the Dragon Hunters.
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.
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.
Heather's brother Dagur shows up out of no where and asks Hiccup for help finding her. He wants to learn to ride dragons. Dagur sees Heather on the edge and goes the extra mile to protect her.