In his bedroom, Johnny Test wrote a note for running away. Then, he packed his clothes, toothbrush, toothpaste, hairbrush, a few snacks in case he gets hungry, a picture of his family members. He climbed out the window and jumped down. Johnny Test took one last look at the Comeau house and left.

In Monster World, Johnny Test says well Mom and Dad if you yelled I'll Never see you again.

When it was 6:30, dinnertime came. "Johnny! Dinner's ready!" But there was no response. Lila went upstairs to check on Johnny. "Johnny, are you okay?" he asked when suddenly, she saw a note on the pillow and it reads "Dear Mom and Dad, I have run away because you mistreated me too much. I hope you will never see us again in Monster World. Sincerely yours, Johnny." Lila began to cry and ran downstairs to tell Hugh, their daughter Mary Test, and their pet dog, Dukey what had happened.

"Dukey! Where's Johnny? What happened to him?" Lila asked, frantically. "He's gone!" Dukey told her. Dukey went over to Mary. "Mary? Where's your brother?" "Johnny ran away from home because Dad mistreated him too much!" Mary explained. "And I'm afraid that he will get killed and I'll might never see him again!" Lila cried and broke down a few sobs. Hugh comforted her and said "Don't worry. We'll find him, and then we will bring him back, I promise." he reassured her. And with that, Hugh, Lila, Mary, and Dukey went outside to look for the missing boy.