Tygra was in the laboratory, looking through the Book of Omens. With his long red and yellow mane tied up in a tail, he tries to decipher the book's secret for a possible way to resurrect their late leader, Lion-O. "Damn! I cannot find anything in the Book of Omens!" Tygra said to himself. "It looks like Lion-O's reservations for resurrections has run out."
Meanwhile, Mumm-Ra spies on Tygra. "What a shame." Mumm-Ra hissed. "The ThunderCats just cannot accept the reality that their glorious leader, Lion-O is dead and gone! Funny, I've accepted it quite well." Mumm-Ra thought of a plan to strike the ThunderCats in their crippled state. "It looks like Tygra needs to forget his troubles." Mumm-ra said. "I know just the thing." With his magic, Mumm-Ra produces in his hand, a single piece of fruit.
Meanwhile, Tygra was still reading and busy deciphering the Book of Omens. "Why can't I find anything?" Tygra shouted in frustration. Just then, Acrapha came in with a bowl of fruit. "Uncle Tygra," Acrapha said innocently, "I brought something for you. It's a bowl of fruit." Tygra looked to his niece. "I'm not really hungry Acrapha." Acrapha was confused on why Tygra was being a little resilient. "Uncle Tygra, you need your nourishment. Please, take it." Acrapha said. Tygra accepted his niece's bounty, thanked her and went back to work.
After Acrapha walked out, Tygra buried his nose in the Book of Omens, randomly eating a piece of fruit. During this time, Mumm-ra magically put in one his fruit in the basket. Unknowingly, Tygra grabbed Mumm-Ra's fruit and took a single bite. Tygra cracked an evil grin and ravenously ate the fruit and any other fruit left in Acrapha's basket.
After eating the fruit, Tygra heard some strange voices in his head. "Tygra..." Tygra was shocked. "What was that?" Tygra said. "Tygra, it's me... your friend... Silkie." Tygra remembered that name though he was still intoxicated by the fruit. "Silkie, you've come back." Silkie said to Tygra in his head, "Do you like my fruit?" Tygra said, "Yes, Silkie. Your fruit is delicious." Silkie then said to Tygra, "I shall give you more fruit... more fruit for your enjoyment! Enjoy my fruit Tygra." Afterwards, one by one, a single piece of fruit was magically produced in Tygra's hands. Each time Tygra ate Silkie's fruit, another piece of fruit came to Tygra's hands for him to feed on, and the cycle continues.
A few days later, the lair was randomly littered with what appeared to be apple cores. "Who's been leaving all of this trash around the lair?" Ailura said as she walked through the lair. "This place is a mess!" Panthro barged in the corridor from another room with a hint of anger in his voice. "Whoever has been littering the lair will find himself envying the garbage!" Panthro shouted.
"Honey, do you know what is going on?" Ailura asked her husband. "This place reminds me of when Tygra was drugged by Mumm-Ra 25 years ago!" Ailura was curious. "Drugged?" Ailura said, sounding as if she was asking a question. "Yes, Tygra was drugged when Mumm-ra disguised himself as some magic tree that gave Tygra pieces of fruit..." Panthro said and suddenly stopped. "Oh shit! Mumm-Ra is at it again!"
Meanwhile, Nocti was visiting her father's gravesite. With a look of sadness in her face, she pays respects to her late father. "Father," Nocti said quietly, "I hope I'm doing you proud. I don't know if I am bringing honor to your name, but I shall do whatever I can to make you proud of me." Just then, Lion-O's spirit came to Nocti. "Nocti, my daughter," Lion-O said, "I am already proud of you. You have brought honor, valor and justice to our world... you and your sisters as well. I am proud of all of you." Lion-O walked to his daughter, who is standing in amazement. "Take care of your mother for me." Lion-O gave Nocti a single kiss on Nocti's forehead and vanished.
Moments later, Nocti sees the Sword of Omens glowing and roaring. "Oh no! Danger is amiss!" Nocti says as she aligns the Sword of Omens to her eyes. "Sword of Omens, give me sight beyond sight!" Through the Sword of Omens, Nocti sees her uncle Tygra, eating Silkie's fruit. She also sees her Uncle Panthro and her Aunt Ailura confronting Tygra and sees that the confrontation grows violent. "Oh no! I have to get back home!" Nocti chanted a magic spell and took flight.
Back in Cats' Lair, Tygra was growing violent. "I don't have a problem!" Tygra said almost incoherently. "Leave me be!" "Tygra, you've been drugged by Silkie's fruit!" Panthro shouted. "You've got to let us help you!" Just then, an white aura surrounded Tygra. Beams of light struck Panthro and Ailura, rendering them unconscious. Just then, Acrapha sees Tygra in his current state. "Uncle Tygra, what happened here? Acrapha asked. "Nothing Acrapha." Tygra said. "Would you like some fruit?"
Moments later, Nocti ran back to Cats' Lair. As she opened the door, she sees Tygra finishing on feeding Acrapha a piece of Silkie's fruit. "Uncle Tygra, what is going on?" Nocti shouted. Tygra just cracked an evil smile and passed out. Acrapha, on the other hand, looked at her older sister devilishly. "Nocti, I want Father's sword!" Acrapha demanded. "Give it to me now!"
Nocti was confused about this, but Acrapha threw a powerful "Demon's Blaze" spell at Nocti and knocked her out. As Nocti lays unconscious, Acrapha walked to her sister and took the Sword of Omens. Acrapha then simply phased out of Cat's Lair.
Later, Mumm-Ra was waiting for the arrival of the Sword of Omens. Acrapha phases into Mumm-Ra's Pyramid with the enchanted blade. "Uncle Muhin," Acrapha said almost incoherently, "I have brought the sword." "Wonderful!" Mumm-Ra hissed out. "With that blade, we can rule New Thundera with the greatest of ease! Acrapha, use your father's sword!" After Mumm-Ra said his words, Acrapha slowly recovers from the effects of the fruit. "Father?!" Acrapha said. "I... I... I SHALL NOT BETRAY MY FATHER!!!!!"
Acrapha readied her father's blade. "How dare you intoxicate me and use me for evil gains!" Acrapha shouted. "You've been a naughty girl Acrapha!" Mumm-Ra taunted. "It looks like your uncle has to bring some discipline to you!" Mumm-Ra raised his decrepit arms to the air. "Ancient Spirits of Evil," Mumm-Ra chanted, "transform this decayed from, to Mumm-Ra, the Ever-Living!" With his dark magic, Mumm-Ra transformed in front of Acrapha. "Now, Acrapha, I shall destroy you!" Mumm-Ra shouted.
Mumm-Ra used his dark magic to attack Acrapha. Armed with only the Sword of Omens, Acrapha used the blade to emit lightning blasts at Mumm-Ra. Mumm-Ra & Acrapha continued to trade blows until Mumm-Ra came close enough to backhand Acrapha, which also made Acrapha drop the sword. "Finally, I shall take your father's blade and plunge this planet into the abyss of an everlasting reign of evil!" Mumm-Ra shouted. As Mumm-Ra walked towards the Sword of Omens, an opening from above exposed a full moon. Acrapha got up and looked to the full moon.
Mumm-Ra was about to grab the Sword of Omens from the floor until he was hit in the back with a giant tail. Acrapha, in her cat/monkey hybrid status, swatted Mumm-Ra with her long tail. "You shall never touch my father's enchanted blade!" Acrapha said in a loud, husky voice. Mumm-ra was astonished that Acrapha become a giant mutant. "By the Ancient Spirits of Evil," Mumm-Ra snapped, "how many of you mutants are with the ThunderCats?"
Moments later, Ailura, Hystalin and Devilman drove the ThunderTank through the pyramid's walls and stepped out of the vehicle. "How dare you use my daughter for your evil gains!" Hystalin shouted. Mumm-Ra got up and attacked the trio with a "Demon's Blaze" spell. Devilman flew out of the way, flew up, and dove head first to Mumm-ra. Unsuspecting, Devilman stuck Mumm-Ra and dug his claws into Mumm-Ra's light blue skin, letting what looks like blood. Mumm-Ra, holding his chest with his left hand, emitted a fire spell with this right hand. Devilman took a direct hit lay to the ground unconscious.
Hystalin, in her Super-Saiyin Level 1 status, prepared the Kay-Oh-Kin technique and attacked her evil brother. Mumm-ra was completely off guard. "What did you do to me?" Mumm-ra said. "In case you didn't know, I know the arts of Kay-Oh-Kin." Hystalin said strongly. "Ailura, Acrapha, distract Muhin while I prepare another attack. Acrapha, still in her cat/monkey mutant hybrid status, and Ailura attacked Mumm-Ra with various magic spells and fighting techniques while Hystalin prepares a magic spell. Ailura and Acrapha managed to give Hystalin about 5 minutes of preparation time, and Hystalin created a single sphere of white light.
"It is done."
Hystalin, with a sphere of light in her hand, waits for a clear shot. "Acrapha, Ailura, I must have a clear shot if I am to use the Spirit Bomb without harming either of you." Hystalin said to herself. Waiting for the opportune time, Hystalin waits for a clear shot. After Acrapha and Ailura simultaneously move in opposite directions, Hystalin sees her chance. "With this Spirit Bomb, I shall vanquish this evil!" Hystalin shouted as she threw the Spirit Bomb at Mumm-Ra. As the Spirit Bomb is thrown to Mumm-Ra's direction, it grazes Acrapha's tail and falls off, rendering Acrapha back to her normal form. Mumm-Ra was completely engulfed in its awesome power and is thrown straight up to the air. "We've done it." Hystalin said. "I think we have seen the last of Muhin."
Later that day, everyone was back at Cats' Lair. Ailura, helping the rest of the ThunderCats clean up what is left of Silkie's fruit. "Mumm-ra sure made a mess of things." Ailura said as she helped clean up the lair with the ThunderCats. Nocti walked up to her mother and asked her, "Mom, why did you want me to stay back?" Hystalin looked to her daughter and said, "Nocti, there was a full moon out. If you left the lair, you wouldn't be able to fit in the ThunderTank." Nocti understood her mother's reasons. The ThunderCats cleaned up the lair in about three hours.
Meanwhile, Mumm-Ra was still being hit by the Spirit Bomb. As Mumm-Ra tried moving away, he moved himself away from the Spirit Bomb and descended to the ground. Mumm-Ra returned to the pyramid and fell in the cauldron. As Mumm-Ra fell, the statues of the Ancient Spirits of Evil's eyes glowed an eerie shade of red. The cauldron bubbled furiously. Mumm-Ra's annoying laughter could be heard throughout the pyramid's halls. Mumm-Ra was not defeated.