After foiling the Beagle Boys, Scrooge and his nephews decipher the strange marking on the map, which leads to a sunken treasure ship in Ronguay. However, Flintheart Glomgold and El Capitán are out to stop them at every turn.
The nephews, Webby, and Mrs. Beakley find themselves joining Scrooge in his adventure as he looks for the second half of the treasure map in Antarctica.
Upon finding out of the Valley of the Golden Suns, Scrooge begins an expedition to find the treasure therein, starting with finding the map that leads to it. First, he must get one half of the map from High Golden Sun Priest Joaquin Slowly.
Scrooge develops gold fever as he and the gang make their way to the Valley of the Golden Suns, all the while pursued by El Capitán.
Christine nervously takes the bench as Dan and Mac try to cover for the newly reinstated Harry, who's planning the greatest gag of all time.
Blackadder becomes involved in politics by getting Baldrick elected MP, in an effort to stop the new Prime Minister, Pitt the Younger, from striking the Prince off the Civil List.
Third Earth is experiencing a total lunar eclipse and Mumm-Ra uses this eclipse to cast a spell that will cause Cats Lair and everything in it to malfunction. The Thundercats first notice this when things start falling apart and fail. Lion-O and Panthro must fight the Mutants while having problems running the Thundertank. They still manage to defeat the Mutants, but crash the Thundertank. Lion-O realizes that this must be Mumm-Ra's evil work and goes to the pyramid to stop Mumm-Ra. Meanwhile Cats Lair is getting worse as Cheetara and Tygra rush to fix things in the lair but are attacked by the Lunataks. They defeat the Lunataks temporarily, but the Lunataks return to finish off the Lair. In order to break the spell, Lion-O must use the Sword to block out the sun
Through paranormal means, Ray's favorite comic book character, Captain Steel, comes to life, and crosses paths with the Ghostbusters. When the evil Doctor Destructo also comes to life, a hero team-up may be the only way to save the world.
After thirteen years of keeping Evie's identity from her, Donna is forced to reveal the truth at her thirteenth birthday party when Evie exhibits a special, alien power that enables her to freeze time. Evie learns she's half alien and that her father is from the planet Antareus--not a CIA agent as her mother has been telling her all along. She is given her father's gift of the cube, a genetic device which allows her to speak to her father on Antareus. Although anyone can hear her father over the cube, her father can only hear Evie.
Vinnie is released from prison where he has been for two years to establish his cover. He meets his boss, Frank McPike and gets to see his coach and mentor, Jerry Greco. Greco is killed and Vinnie demands to be put in to finish the investigation. He uses his ingenuity to get a foothold in the Steelgrave crime family, but it will take a while to finish this job.
Bob Ross creates an innocent creek that slices its way across a landscape of color in a setting dreams are made of.
Jenny's dog Jake runs away after chasing a cat. Jonathan and Mark find the dog and take him over to orphanage to help cheer up the kids. Jonathan and Mark must try to get Alex to become active again. They use Jake and get him to play with the other kids. They soon learn that Alex is afraid that if he touches anything it will be taken away from him.
Vultureman develops a sonic gun to destroy the Thundercats. Since the other Mutants refuse to help, Vultureman decides to go on his own until the Lunataks ""kidnap"" him and force him to help them. Vultureman uses a legendary sound stone to power the device and he and the Lunataks use it against the Thundercats at the Tower of Omens. The Thundercats barely escape and are saved by Lion-O, but they lose the tower to the Lunataks. The Thundercats must design a sound weapon of their own with a sound stone to counter Vultureman's weapon and retake the Tower of Omens.
A young man hurt by the woman he loves decides that there is far too much pain in the world and, aided by his loyal yet reluctant companion, sets about a chain of events that will bring Ragnarok, the end of the world!
While burying one of the time capsules that transported the Thundercats to Third Earth, it smashes apart and Lion-O gets caught in its gases, making him younger and younger by the minute. The other Thundercats must find a way to reverse the process and realize the Cave of Time is the only way, but they must get Lion-O there before he "vanishes" from existence. Things get worse when the young Lion-O and Snarf are captured by the Lunataks.
When Slimer passes through Egon's latest invention, he is broken up into thousands of tiny Slimers that coat the city in a layer of green goo. However, the Ghostbusters' solution to the problem only results in a large – and angrier – Slimer.
Set in a Washington, D.C. bar, Fred Willard was the bartender, and the patrons were all Krofft puppets, including former U.S. Presidents Reagan, Carter, Ford, and Nixon, and news reporters Dan Rather and Ted Koppel.
The Rani's impersonation of Mel backfires badly because Urak can't tell the difference, while the Doctor attempts to learn the secret of the Loyhargil.
Mumm-Ra uses the Beacon of Ravage Island to make the Thundercats his slaves. When the beacon puts Lion-O, Panthro, Cheetara, and Pumyra under its power, they are easily captured by the Mutants, and Snarf must get the others at the tower for help, but Ben-Gali soon falls under the beacon's power and it's up to Lynx-O, Snarf and Snarfer, to save the "enslaved" Thundercats.