For Protection against Tom's approaches, Jerry aquires a Belt that can summon a Ninja at the Push of a Button from a smiling sales mouse.
Tom is lounging in a big chair using Jerry as a yo-yo. Jerry grabs hold a bouquet of flowers from a vase and stuffs the flowers in Tom's Mouth. Jerry runs while Tom grabs a pool cue and eight ball which he uses to roll Jerry out the house and into a garbage can. Jerry climbs out of the trash only to be greeted by Dave D. Fender of the Mutual Ninja Mouse Protection Agency Policy who gives Jerry a special Alert Belt that calls Ninjas to his defense. However, Jerry has to sign a contract in order to wear the belt, which He does. Now fully confident, Jerry kicks in the house door smash Tom with it. Tom is angry about this and tries to frighten Jerry but is unsure when Jerry is not the least bit concerned. As Tom is about to smash Jerry with a fireplace shovel, Jerry activates his belt and a Ninja appears and sliced off one of Tom's whiskers and wrapping the shovel around his neck. Jerry runs off and Tom goes to get the shovel off himself as the screen blacks out .
We find Jerry lying lazily on a broom which Tom takes and starts chasing Jerry with. Jerry calls the Ninja again who appears and uses his sword to slice up the broom. Tom runs up a hat rack, but the Ninja follows and slices down the lamp into itty bitty pieces. Again, Tom loses another whisker to the sword. As Jerry walks along confidently Tom appears and captures Jerry with a lasso before Jerry can call for help. Jerry is then taken to a pool table and placed on it. Tom is lining his shot with the pool cue and as Tom is about to strike, Jerry turns quickly causing Tom to activate the belt with the pool cue calling the Ninja to Jerry's aid, resulting in Tom loses another whisker. Tom tries a new tactic involving a large barrel as armor, along with Prongs and a Spatula as Weapons. but Jerry tricks Tom into pressing the belt button and the Ninja comes to his aid. The Ninja enters the barrel and causes some damage to Tom who then runs up a flag pole which the Ninja cuts down cause Tom to land on the roof of a Different house, making the shingles to come apart, along with the wooden interior as the Screen blacks out again.
Late at night, we see Jerry sleeping in his bed and Tom lurking outside Jerry's mouse hole. Using a clothes hanger, Tom steals the Alert Belt. Jerry stirs from hearing Tom's Laugh and sees Tom with the belt who then swallows it much to Jerry's disbelief. However, when Tom hiccups the belt activates, calling a Ninja. Tom runs as the Ninja follows and cuts down everything that Tom climbs up on, including a Mailbox. However, every time Tom hiccups the belt calls another Ninja. Finally, Jerry wakes up again to see Tom is stuck in a tree as the ninjas continue to multiply, thanks to all the hiccupping Tom has been doing as the screen blacks out yet again at the end of the episode..
For the gallery of S.O.S. Ninja, click here.