- The "Grow Your Own Monster" kit that Johnny ordered has finally arrived! He quickly puts the Monster pill in a glass of water. Johnny doesn't realize the girls have switched his glass of water with the side effect of their "Behavior Modification Serum" hoping he would drink it. Johnny is on the verge of giving up, when suddenly his monster gets bigger and comes to life! Johnny can't believe his luck, while Dukey can't believe this can be a good thing. The girls reassure Dukey that the monster will be fine as long as it stays small; unfortunately Johnny puts "Gammy" in the family swimming pool! As he's growing Gammy is becoming more and more aggressive and leaving a trail of destruction through Porkbelly. Will the military be forced to stop him or will the girls be able to get him the serum that will mellow him out? / Johnny has vowed to never speak to Sissy again! Unfortunately, Mr. Teacherman pairs them up for a class project. Johnny he needs an A or he'll be heading to the "special classes" with Mrs. Crabapple. Johnny does NOT want to become one of Crabapple's Bad-Apples, but he can't be Sissy's partner either....she's nuts. Johnny does the only thing he can - he consults his sisters. They tell him that he and Sissy have incompatible personalities but they can change his personality in their new invention - the Personality Twister. Johnny agrees and he comes out new and improved. Mom and Dad discover Johnny has had a personality makeover, they like the new Johnny but they have to tell the girls to turn Johnny back. However there is a small problem - the machine has lost Johnny's DNA sample and doesn't seem to know who Johnny is. Will the girls ever be able to get the old Johnny back?
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