Tummi builds a full size boat, which Gruffi wants scuttled. However, out of respect for all the work done, he allows Tummi one sailing trip. This trip takes an unexpected turn when they end up on a volcanic island inhabited only by another Gummi Bear - an artist by the name of Gusto.

Tummi accidently causes a swarm of bugs to attack the gummiberry bushes.

Something is fishy when Sunni is jealous of Gusto's new friend Aquairanne.

While trying to find out why winter is still persisting in Dunwyn alone, Sunni, Tummi and Cubbi encounter a frost giant named Chillbeard who uses a "wind horn" to freeze everything. The cubs wonder why Chillbeard seems immature for the "Lord of Winter", wanting to play games instead of allowing spring to start.

A traveler from the Orient searches out the Gummi Bears to honor an ancient pact of friendship and help concerning a dragon.

Sunni enters a costume contest in Dunwyn during folly day.

Cavin becomes a great painter with a LOT of help from Gusto.

When Gruffi breaks his foot, he stubbornly refuses to stay put, believing that the Glen would suffer if he doesn't remain active. His attitude doesn't improve when a rowdy bandit gang decides to make camp--right above the Gummi Glen abode.

Inspired by some old stories, Cubby constructs a flight pack and races off into the clouds to find the legendary Aerials. Unfortunately, the Aerials are not like the old Gummi stories described, in more than one way.

Tummi finds a Gummarine, an ancient seagoing vessel that can take the Gummies to New Gumbria, where they can meet other Gummies. However, their plans are quickly derailed when Duke Igthorn captures the ship and uses it to attack King Gregor.

Gusto inspires delusions of grandeur into Gruffi's bridge project.

When rules don't seem to have any effect, Cubbi learns an important lesson of life from Gusto by living with him for one day.

Gusto creates a lifelike stone statue of Zummi, then persuades Zummi to come to his workshop so he can create a better one. Meanwhile, Gruffi mistakes the statue for his friend, believing that Zummi has turned himself into stone - and so does Lady Bane.

With no sign of Igthorn for an entire year, not even in his own castle, Zummi Gummi finds this news as a perfect opportunity to call on the Great Gummies (much to the skepticism of Gruffi). However, Igthorn has recently devised the ultimate plan to finally capture the Gummies, obtain the Gummiberry juice, and take over Dunwyn.

Igthorn and his ogres have destroyed Gummi Glen, captured Dunwyn Kingdom and its citizens, and are keeping Grammi and Tummi held in Drekmore. Now Cavin and the remaining Gummies, with the help of the Barbics, must save them all while Zummi retrieves the Great Book and warn the Great Gummies to turn back.

When Lady Bane gets a lock of Sunni's hair, she uses it as part of a spell to keep her eternally young. Unfortunately, the spell also ages Sunni from a young Gummi to an old Gummi.