With the trolls hiding out in Arcadia, AAARRRGGHH!!! goes undercover to see what Gunmar is up to. A potential rival brings out Jim's jealous side.
When Barbara's art obsession leads to an "aha!" moment, she demands Jim tell her the truth. Dictatious reveals Gunmar's plans to resurrect Angor Rot.
Could giant ancient drawings found etched into the desert floor be part of an ancient alien code?
Dad annoys everyone with his old ventriloquist dummy Lord Luck, while Jonny's recently dumped friend Ben comes for dinner in need of cheering up.
The guests on Graham's sofa are Chris Pratt, Bryce Dallas Howard and Jeff Goldblum, who star together in new sequel Jurassic World: Fallen Kingdom. Plus music from Jake Shears, who performs Creep City.
Merlin has a plan to go to war, but it's Jim's choice to make. Blinky and AAARRRGGHH!!! search for allies. Gunmar uses Barbara to get what he wants.
The Eternal Night covers Arcadia in shadow, leading to a long-awaited showdown between Gunmar and the newly transformed Trollhunter.
An epic battle comes to a head in the darkness as Jim and his friends push back against Morgana. But without Merlin, how will they stop her?
Señor Uhl interrupts an important mission with an awkward ultimatum for Jim: help two new students fit in ... or face a repeat of sophomore year.
Toby and Darci ask Jim and Claire on a double date. Gunmar returns from his travels, now armed with the knowledge to bring forth the Eternal Night.
Douglas discovers that a nearby island is inhabited and wants to visit, but Brett, desperate to stop him leaving, puts him on trial for 'assaulting' Susan. Meanwhile, Arnab attempts to convince Susan that having sex with him will make Douglas jealous.
Winter winds force the captains to reevaluate risk and reward. Shawn's mega-barge extraction takes a turn for the worse. Ken pushes the Myrtle to the limit on a 5-day run. Emily sends her divers deeper. Kris invents a new form of prospecting.
A long-dormant ally shows Jim and his friends what really happened at the Battle of Killahead. Gunmar awakens Morgana, and Angor Rot plots his revenge.
Sid the Pirate and Arrby steal the ferris wheel. When the pups set out to bring it back to Adventure Bay, Sid comes up with a sneaky plan to steal the Sea Patroller.
A greatly changed Jim renews his Trollhunter training but struggles to accept his new reality. Gunmar and Morgana rally the troops for an attack.
Something strange is brewing at school, where the teachers are more agitated than usual. Claire's illness shows disturbing side effects.
The Z-Force gives Max and Phoebe a superhero day off, but when they relive the day over and over again, they must find a way to break the loop.
When Scrooge unexpectedly disappears during his birthday party, Huey, Dewey and Louie find themselves hosting a mystery party where everyone is a suspect.