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.
While Gunmar searches for the Staff of Avalon, Jim and Toby head into the Shadow Realm to rescue Claire's spirit and return it to her body.
With the future of two worlds at stake, the team races to find Merlin's Tomb -- and the Staff of Avalon -- before Gunmar can get his hands on it.
Toby gets caught in the crosshairs when a troll goes missing and the city cracks down on crime. An ancient voice refuses to be silenced.
Phoebe and Max are determined to make their 100th save their best and most memorable one yet, but by ignoring a series of small saves they overlook a supervillain plotting revenge on Hank and Barb.
Max finally declares his independence from his parents' house rules and moves to his friend's house, where they only rule is that there are no rules; ultimate freedom quickly becomes more than Max can handle.
Vince is torn when his old high school buddy offers him a dream job that would require him to move to Louisiana; Matthew graduates high school; Michael's crush joins the guys for dinner at their place so Vince can suss out his intentions.
As Michael prepares for the opening night of his new musical, he receives a surprise visit from his mother, Priya, who wants to bring him back home to Cleveland with her; meanwhile, Matthew is in charge of employee performance reviews.
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 Arc gives Ciara a bottle with a genie inside, she decides to make a wish so that she can attend Knight School. But, when Sage becomes princess and gets the bottle so that the genie, Kiki, is hers, Arc and Ciara have to get it back.