Tummi learns through his new friend, the blind shepherd Trina, that handicapped people are not helpless.

There is a thief in Gummi Glen, so Zummi and Grammi team up to find the rat. Unfortunately, Zummi casts the wrong spell which ends up shrinking them to a dimunative size, and they only have a limited amount of time to reverse it.

When the castle of the knights of Gummadoon appears, Cavin is imprisoned as a spy. The Gummies only have until sunset to rescue him, as the castle only appears once every hundred years, but they also have to contend with Duke Igthorn, who plans to capture the castle.

Zummi finds a section of the Great Book of Gummi that contains advanced magic spells. However, this also signals Zorlok, an evil wizard whom the Great Gummis had imprisoned in a subterranean prison, that he can find the unlocking spell, then be free to inflict violence on all Gummi Bears the world over, then conquer the world. To do this, Zorlok creates a monster to steal the Great Book, causing Zummi, Grammi and Gruffi needing to track it down.

A Gigglin causes a practical joke spree in the Glen. Will this stop the dam from being built in time to stop the water from flooding in?

An accidental mixture of Gummiberry juice and baby powder reduces Igthorn's Ogre troops to infants, and Grammi takes in one of these babies to raise it for the better.

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.

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.

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.

King Gregor hosts King Jean-Claude, a ruler of a nearby Frankish kingdom, and his daughter Marie in order to improve diplomatic relations; but both Sunni and Calla learn that being a princess does not make one an instant sweet little girl. Even worse, Marie's haughty attitude eventually causes King Jean-Claude to stage a military siege on Dunwyn.

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.

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

Duke Igthorn catapults Toadie into the forest, where he accidentally makes his way into Gummi Glen and begins snooping around. When Tummi, who has been caught eating the other bears' picnic lunches and lying about it, sees him, no one believes him when he tries to tell them.

The Gummies find a Gummiscope, a gigantic machine that harnesses sunlight as a means of long-range communication, that could allow them to make contact with the Great Gummis across the ocean – but it can also be used as a weapon, causing Duke Igthorn to use it as a laser-type weapon to force King Gregor into surrender.

After an autumn of hard work and preparation for the coming winter, the Gummis are looking forward to the holiday of Fall's Farewell, but Sunni goes overboard with the celebration trying to impress Calla.

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.

King Gregor proposes a series of tests for Unwin and the other squires to become Princess Calla's bodyguard, which includes stealing a golden apple from the strong and mysterious Black Knight. Calla conceals her appearance in a suit of armor and competes as well to prove she is capable of her own self defense.

Eager to meet the Barbics, Cavin accompanies the Gummis on a trip to Ursalia. He is at first not welcomed by the Barbics, but soon gets the chance to prove himself in a manhood ritual which Buddy has to undergo in order to become a full member of his tribe. However, a pair of satyr poachers are on the prowl looking for furs to line their purses – and the Gummis just so happen to be quite hairy ...

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

Tummi takes pity on Doctor Dexter, an unsuccessfull pharmacist, and decides to improve his concocctions with a shot of Gummiberry juice. Unfortunately, this new wonder medicine also attracts the attention of Igthorn, and without the knowledge of how to exactly replicate the formula, the Doctor is caught between a rock and a hard place.

Igthorn comes into the possession of an invincible magical suit armor of an infamous villain from the past. Unfortunately, this armor fits diminutive Toadie only, and once the dwarfish Ogre realizes its power, he simply decides to take his Dukie's place as the ruler of Dunwyn!

Grammi and Tummi go to feed a flock of giant birds just returning from their winter quarters, only to be forced to protect them from Igthorn hunting these birds to use them as war steeds and take care of one of their young at the same time!

Duke Igthorn sends a cursed gargoyle to King Gregor. The gargoyle comes alive at night and starts trying to destroy things – including the king himself.

Tummi has to clean up a big mess in Gummi Glen and bemoans that he is slow at the job. After tricking a tired Zummi into casting a spell on him, he learns that faster is not always more efficient when the spell proves unpredictable.