Tom and Jerry have brought the egg back to their home and Athena gets Tom to sit on the egg. She turns them into cat-like-bat creatures to search for the egg. Drizelda becomes angry at them because that egg could help her in her plans to takeover the town, Hamlet. Tin, Pan and Alley return to Drizelda but discover that the egg is gone. Tom and Jerry discover the egg on the lily pad and decide to take back home. Meanwhile Athena is busy washing the animals and sends Tom and Jerry into the forest to get water. The fire burns Tin's bag and the egg falls out and lands on a lily pad rolling down the river. They are attacked by a dragon who chases them out. While the other two cats take some treasure, Tin gets a big egg that looks like a pearl for Drizelda.
In the forest, Drizelda's hench cats, Tin, Pan and Alley head for an old cave full of treasure. Back at their home, Athena promises the animals that she will find somewhere where they belong.
After a few minutes of being liked after helping a donkey, Buster, Tom and Jerry accidentally destroy some of the work the town have been preparing for the Harvest Festival which causes Athena to run back home in tears. Meanwhile, Athena is not liked by the elves because she is related to Drizelda. Tom and Jerry try to stop a hyperactive boar called Buster from going into the town. Athena leaves for the town to get food and some donations for their home and leaves Tom and Jerry in charge of the place. Years later, Athena, Tom and Jerry are grown up and have opened a business called Athena's Home For Unwanted Animals. Athena and her new pets Tom (as a kitten) and Jerry (as a newborn baby mouse) are raised by Kaldorf. The elves celebrate their Harvest Festival. Drizelda tries to turn everyone into wart ogres but Kaldorf uses his magic staff to throw Drizelda far away into a volcano. Drizelda tries to make Athena come with her but Athena decides to stay with Kaldorf. The film begins with Kaldorf banishing Drizelda for her evil deeds and mistreating her niece, Athena, for the last time. The action takes flight in a climactic ending filled with might, magic, and cartoon mayhem of course! Can Tom and Jerry help this tale end happily ever after? Find out with this rip-roaring adventure for the whole family! The angry mama dragon wants her baby back, but she’s not the only one…a powerful witch named Drizelda captures the baby dragon for her own wicked plans! With the help of powerful allies and animal friends, Tom and Jerry must fight tooth and claw to stop the witch and get the baby dragon back to its mother. Little do they know, this egg was stolen from a very large fire breathing dragon! In short time, baby Puffy hatches from his egg and takes Tom as his mommy.
The adventure begins when Tom and Jerry happen upon a mysterious glowing egg. Your favorite cat and mouse are back with song, sorcery and slapstick in this enchanted tale.