Russell Huxtable pays his granddaughter Denise a visit, which puts a damper on her plans to pull a prank with her friends.
The ThunderCats build a Homing Beacon Tower just in time to guide a group of Thundarian refugees back to the planet.
A rare lunar eclipse casts an eerie pale over the new ThunDERa. The eclipse opens a portal where the exiled Shadowmaster contacts the Ancient Spirits of Evil.
Mumm-Ra unveils his latest weapon, the Babylonian Barbarian Boiler, to destroy the ThunderCats. The Boiler emits a beam that rapidly melts anything it touches.
Captain Cracker attacks bounty hunter Captain Bragg, who is holding the exiled Luna-Taks prisoner, and frees the Luna-Taks in order to have them help him return Third Earth to a pirate's paradise.
An astronomical lineup of the five Thundarian moons causes a serious drought on the new ThunDERa. Panthro and Snarf take the ThunderTank to collect the remaining water of Dreary Canal. On the way, they are attacked and the ThunderTank crashes.
Wilykat and Wilykit discover the Golden Sphere of Setti, an ancient artifact that once belonged to Mumm-Ra. The sphere magnifies his power by four, making him more powerful than the Ancient Spirits of Evil.
Mumm-Ra realizes he must destroy the new ThunDERa in order to destroy the ThunderCats, so he travels to the Great Beneath and blasts the gyroscope into rapid decay.
Enraged by his failure to destroy the ThunderCats, Mumm-Ra returns to the Great Beneath as Jaga the Wise.
With Mumm-Ra banished form Third Earth, the ThunderCats return to their home planet ThunDERa. The Ancient Spirits decide to give Mumm-Ra one last chance to destroy the ThunderCats.
The Ancient Spirits give Mumm-Ra until sundown to destroy the ThunderCats or be banished from Third Earth forever.
Mumm-Ra's mentors, the Ancient Spirits of Evil, threaten to relinquish Mumm-Ra's rule over Third Earth if he fails to destroy the ThundarCats.
Snarf discovers an ancient Thundarian artifact, the Thunderscope, amid the wreckage of the ThunderCats' original spaceship. The object has the power to immediately identify any object of Thundarian origin.
Snarf accidentally discovers the Bracelet of Power has the power to control the ThunderCats. Gradually, he starts to coerce the ThunderCats to do his bidding. Snarf then loses the bracelet to Mumm-Ra.
Mumm-Ra retrieves the ancient Thundarian artifact the Locket of Lies. Mumm-Ra and Ma-Mutt use the artifact to lure the ThunderCats into a concealed pit-trap.
Download the TV Guide app for iPhone, iPad and Android!