Gruffi burns the Great Book of Gummis and goes to Ursalia to find another to replace it. Their he meets Thornberry, a gummi who tries to save Ursalia from an evil witch, Lady Bane!!
In an attempt to cheer Screech up enough to complete their science project, Zack pretends to know a girl who is interested in Screech, but things soon become complicated.
When it's spring cleaning time in the castle, Link pretends to have a cold in order to get out of doing work.
Mumm-Ra summons Malcar, an ancient alchemist, to return from the dead. The alchemist returns old and weak, as he was when he died. Mumm-Ra takes him to the forest of youth to restore his youth and power. Malcar regains his powers, and uses them against the Thundercats. He transforms all the Thunderillium on the planet into Thundrainium.
The investigative trail leads Chip, Dale, Monty, Gadget and Zipper from Glacier Bay to a dog pound and then to the subway where they find Claudaine, who masterminded this whole thing.
Claudaine and Nimnul plot together and build a huge jello mold, which they plan to use to cause an earthquake to crack open a Reserve Building vault so they can steal all the gold inside it.
When an old detective friend is falsely accused of stealing a priceless ruby, Chip and Dale decide to take on the task of solving the crime themselves, in this introduction to the series.
Monty suggests they visit his old friend, Geegaw Hackwrench, but instead find Geegaw's daughter, Gadget, who flies the group to Glacier Bay as they continue their investigation.
Chip and Dale are hot on Fat Cat's trail, who leads them to a Chinese laundry and then to a fishing vessel where they meet Monty and Zipper for the very first time.
When it's spring cleaning time in the castle, Link pretends to have a cold in order to get out of doing work.
The dreaded Queen Rotunda of Rotundaland falls in love with Mario when she mistakenly drinks a love potion and tries to force him into marriage.
Jaguara cannot work New Thundera’s Gyro on her own. The Thundercats order a robot to aid her in running the Gyro. Screw Loose, a robot who specializes in Gyro’s, comes to New Thundera. Mumm-Ra manages to mess up Screw Looses brain so he becomes destructive instead of helpful. The Thundercats must help Jagara get Screw Loose under control, before the entire planet is destroyed.
The Doctor and Ace discover a stone spaceship underneath Warmsley's archaeological dig while Mordred summons Morgaine to Earth's dimension.
Wily Kit and Kat, exploring New Thundera, stumble upon an Orb of Gold, and pick it up thinking that it is apart of their Heritage. Possessed by the power of the Golden Sphere of City, the ThunderKittens get greedy, and let the power of the orb overcome them. Mumm-Ra manages to get a hold of the orb, and his powers get four times more powerful. He gets so powerful, he destroys the Sword of Omens. Jar, the scrap metal collector reforges it for Lion-O. He gets so powerful that he challenges the power of the ancient spirits of evil. They lock him out of his pyramid until he surrenders the Orb to them. The spirits of evil let him back in, but destroy the Golden Sphere of City.
Enjoy this fascinating experience of watching Bob Ross bring these deep dark woods alive; incredible magic on a partial black canvas.
When the Marios buy some magic garbanzo beans they are lead up the beanstalk to face a Giant Koopa.
Our heroes think they are going to a benefit Spaghetti Dinner at the Linguini Empire Colosseum, but it's all a plot by the evil Emperor Augustus Septemberus Octoberus Koopa to feed the Marios to the lions.
Roseanne tries her hand at telephone solicitation while trying to console Becky who had an embarrassing accident in front of the school council.
Wily Kit and Kat are constructing a well for the New Cat's Lair on New Thundera. The Thundercats on New Thundera receive a distress signal from Thunderian refugees trying to find their way to New Thundera. The Kittens are left alone with Snarf on at the New Cat's Lair, and Lion-O and Snarfer are out constructing an early warning device (I guess for weather purposes). The rest of the Thundercats seek out the refugees in space. When Wily Kit and Kat strike water, they accidentally unleash a monster that Jaga trapped in the underground lake centuries ago. Frogman, with aquatic powers, tries to sink the New Cats Lair. Lion-O however re-traps Frogman in his watery prison.