In a haunted, creaky mansion, Tom chases Jerry through dim hallways and toppled furniture, turning their age-old game into a chaotic spectacle of squeaks and splinters. Down in the basement, Chip, a wiry wizard with a knack for mischief, tries to brew a potion using his magic ring, but an ill-fated choice of milk sends the brew off course. The result is a deal: if Tom guards the ring and keeps mischief at bay while Chip travels to Calcutta to fetch the correct milk, he’ll earn a juicy salmon as a reward; fail, and he’s out on the street. Meanwhile, Jerry stumbles upon the ring, slips it on like a crown, and bolts from the mansion, prompting a determined chase through sunlit streets and shadowed alleys alike.
The ring’s glittering power soon spirals into a string of comic catastrophes. Tom heads to a jewelry store to recover the ring, but the owner is away for lunch, so Tom sneaks in and poses as the proprietor to help release the enchantment—yet the ring stubbornly clings to Jerry’s head. Jerry then slips into a house where he encounters Butch and [Droopy] (not listed in the cast), a pair whose antics add to the confusion. Butch makes a strenuous, misguided attempt to pry the ring off Jerry, only to fail again. The chase spills into an alley where an alley cat lies in wait; Tom arrives, tapping into the ring’s magic to rescue Jerry from danger. Butch returns and eventually the ring flicks back onto Jerry’s head, turning the pursuit into a wild game of cat and mouse between Tom, the alley cat, and Butch as they chase through streets and back alleys. A banana peel ambush sends Tom sprawling outside a pet store, unconscious but still part of the spectacle.
Inside the bustling shop, a kindly old lady runs a world-spanning pet emporium and opens her cages to the day’s chaos. Tom finds himself paired with Spike and his eager son [Tyke], while Jerry winds up in a cage with two small mice named Freddie and [Joey] (both named, but Freddie carries the fortune of voice talent here), who pick on a diaper-wearing mouse named Nibbles. The nimble Jerry uses the ring to stop the bullies and bend their bravado into a cheese-themed punishment, turning troublemakers into chunks of cheese. When the cheese mice escape, Jerry calls on the ring to magnify his ally; [Nibbles] grows into a colossal giant who chases the cheese mooks from the store in a dazzling display of magical mischief. A boy purchases Jerry for his own collection, but the ring’s magic melts Tom’s restraints and frees him from captivity, enabling a daring escape aboard a bus steered by Droopy as the pair race into the street.
The pursuit continues through a junk-filled landscape: the alley cat, [Butch], [Spike], and [Tyke] join the chase, while Tom and Jerry weave through garbage heaps and clattering garbage trucks. The ring’s power freezes the would-be captors—Butch, Spike, Tyke, the alley cat, and even the responding police cars—creating a temporary, glittering standoff that leaves Tom and Jerry momentarily safe to reconsider their next move. They head back toward the mansion, where Tom makes another bid to remove the ring, and Jerry hides away in a kitchen cupboard, waiting for a chance to end the magical chaos with a practical tool—the furniture ring remover—before hurling the ring back into the basement.
The moment arrives when Tom retrieves the ring, only to be stunned as it stubbornly refuses to come off his finger. Chip rushes home and, believing Tom has stolen his ring, kicks him out of the mansion, causing the ring to tumble free. The spell breaks in a chorus of renewed chaos: the previously frozen Butch, Spike, Tyke, the alley cat, and the police cars snap back to life and give chase as Tom flees once more toward the setting sun. In a final turn of fortune, Chip becomes Jerry’s guardian, offering him the promised salmon, while the ring’s remaining magic reshapes the moment by turning that very salmon into cheese. The mansion fades into the horizon as the duo—Tom in retreat and Jerry grinning at the ring’s strange gifts—settle into a precarious, if quirky, partnership that promises further adventures in a world where magic and mischief always seem to collide.
