1¡ThunderCats Ho! (Parte 1)
Una pesadilla atormenta a Leon-O. Piensa que fue salvado de la destrucción de su planeta de joven a costa del sacrificio de otros 3 Thunderianos. Jaga le confirma a Leon-O que su pesadilla es falsa.
2¡ThunderCats Ho! (Parte 2)
El intento de rescate de Lion-O fracasa y los Thunderianos capturados son llevados a la Montaña Roca de Fuego después de otro intento fallido de su parte para liberarse de sus captores.
3¡ThunderCats Ho! (Parte 3)
Lion-O pierde la Espada del Augurio en una avalancha. Panthro lucha contra el Fist-Pounder con el Tanque felino. Los mutantes llegan a la Montaña Roca de Fuego para tomar el control de los prisioneros.
4¡ThunderCats Ho! (Parte 4)
Los Thunderianos intentan escapar de su prisión. Lion-O llega a la Montaña de Rocas de Fuego y se enfrenta a Hachiman, quien cree que Lion-O está causando el sufrimiento de su antepasado.
5¡ThunderCats Ho! (Parte 5)
Lion-O y Hachiman se reconcilian y los ThunderCats se acercan a rescatar a los Thunderianos de la Montaña de Rocas de Fuego, pero necesitarán otro tipo de ayuda si quieren pasar a través de los gases de Thundranium para llegar a ellos.
6Mumm-Ra Vive - Parte 1
Mumm-Ra is weak and faces the threat of three new ThunderCats; he sends the Mutants to release his old enemies, the Lunatacs, imprisoned in Dark Side[29] in order to bolster the forces of evil. The ThunderCats' celebration of their victory over Mumm-Ra and the welcoming of three new ThunderCats is cut short when Snarf overhears plans at Castle Plun-darr after he chased Ma-Mutt there from the Berbil village.
7Mumm-Ra vive (Parte 2)
The Mutants succeed in releasing the Lunatacs. The ThunderCats discover their Thundrylium mine is being looted and people are being kidnapped from the villages. Lion-O & the ThunderKittens have their first run-in with a Lunatac and Bengali's skills as a blacksmith come in handy.
8Mumm-Ra vive (Parte 3)
The ThunderCats build the Tower of Omens to monitor for Sky Tomb, which will be run by the new ThunderCats. Disguised as a Berbil, Ma-Mutt spies on the ThunderCats' plans and the Lunatacs are sent to destroy the Tower. Snarfer contacts Snarf to tell his uncle that he's returning to Third Earth.
9Mumm-Ra vive (Parte 4)
Mumm-Ra's power is restored. Snarfer makes it to Third Earth, but crashes in Dark Side. The ThunderCats rush to his aid before the Lunatacs can get a hold of him.
10Mumm-Ra vive (Parte 5)
The ThunderCats look for Sky Tomb to free the slaves imprisoned inside it. Bengali must learn the importance of teamwork as Lion-O leaves him with guard duty. Lynx-O and Cheetara run reconnaissance to find out if Mumm-Ra is truly back or not.
11Riña gatuna
By disguising himself as Jaga, Mumm-Ra tricks Lion-O into believing the new ThunderCats are traitors so that they will fight amongst themselves.
12Dominados
Mumm-Ra tells Alluro where to find a talisman that boosts the self-confidence of the one who possesses it so that they become nearly invincible. Snarf learns that true courage comes from within.
13La máscara de Gorgona
Ma-Mutt digs up an ancient book, which leads Mumm-Ra to search for the ancient evil of the mask of Gorgon
14El monstruo burbuja
The Lunatacs look for Thundrylium in a cave on Hook Mountain, only to be driven mad by a strange creature that turns them against each other.
15Siempre unidos
Mumm-Ra coats the Bezerker's weapons and armor with Thundranium. Wilykit and Wilykat find that guarding Cats' Lair is not always a breeze.
16Isla del mal
Mumm-Ra activates a mesmerizing beacon on Ravage Island, which draws the ThunderCats to it and takes hold of their minds.
17Cápsula del tiempo
While taking care of a dangerous Suspension Capsule, dug up near Cats' Lair, Lion-O is exposed to harmful gasses inside that cause him grow younger. If the ThunderCats do not find a solution in time, he will rapidly become younger until non-existent.
18Las piedras de sonido
Vultureman builds a sonic gun from a sound stone he stole in Dark Side as the Lunatacs join with him to attack the Tower of Omens.
19El día del eclipse
The day of the centennial total eclipse has arrived, and any spell Mumm-Ra casts will last until the next eclipse. He declares a "Day of Decay" on the Cats' Lair, causing it to fall apart.
20El arresto
Chilla freezes Snarfer's spaceship as he heads back to the Tower of Omens with Berbil Mexican takeout. When Mandora gets involved, Chilla freezes her and becomes a fugitive from the law as Mandora sets her sights on bringing her in.
21El cinturón de Mumm-Rana
Luna discovers that her grandmother's magic belt is now in the possession of Mumm-Rana, who claimed it after battle. She heads straight for the white pyramid, with Pumyra hot on her tail.
22El honor de Hachiman
While Hachiman is on his way to the Tower of Omens, Luna steals his sword, the ThunderCutter, and gives it to an automaton. Lion-O and the ThunderKittens head out to find their old friend.
23Los fugitivos
Fed up of feeling useless, Wilykat convinces his twin to run away from home, but living on their own is more dangerous than they realized. The other ThunderCats search desperately to find them as they all must learn a lesson in communication.
24Ma-Mutt en acción
While all the ThunderCats except Lion-O are gone, Mumm-Ra switches Ma-Mutt with Snarf. Ma-Mutt poisons Lion-O, allowing Mumm-Ra to move in.
25La venganza de Buitro
Vultureman builds a Thundranium[28] projector, capable of creating concentrated regions of Thundranium. When the ThunderKittens damage it, he damages their spaceboard, sending them off into danger. While Lion-O and Snarf search desperately for them, Vultureman plans his revenge.