(Warning: may contain spoilers) On the 4th of July, Timmy's parents give him a hat. A pie comes out of it and hits him in the face. Later, on Halloween, Cosmo and Wanda give him a pumpkin. Again a pie comes out and hits him in the face. Later, even his friends Chester and A.J. do a painful prank. they give Timmy a robot which attacks him.
Timmy invites The April Fool to help him take revenge. In the middle of his joke, Fool comes to Timmy's room and gives Wanda prank flowers. As she enjoyed them, syrup sprays in her face. Next, Fool extends his hand to Cosmo. When he shakes it, there is a buzzer. Timmy asks the Fool to prank everybody who pranked him.
Fool makes a sign appear, at school, telling Chester to look up. A magnet pulls him up and a fan spins him as payback for the biting robot. Also, Timmy hands a phone to A.J. saying "for you". He takes it and flames burn his papers. A.J. was prepared with a copy, but more flames burn the copy too.
Next is Vicky's turn. Fool gives Timmy a drink which he brings to Vicky. She drinks and tells the truth to her date, that she only likes him for his money. He is insulted.
The last payback is for his parents' pie prank. Mom and Dad jump from the plane. Their parachutes open but Fool does a prank changing the parachutes into hogs. Timmy only wants to prank them but not hurt them, so he wishes the pigs were balloons. Timmy's parents float, until Fool makes the balloons vanish. His parents fall, so they pull the extra parachute, hoping to slow the fall, but that is also pigs so they are in danger with no parachutes and worse they are falling towards broken glass. Timmy wishes that they land on pillows and they are not hurt.
Fool wants to bounce the moon between the Sun and the planet Earth which will cause another ice age.
How will Timmy stop this plan? Watch the episode and find out how Timmy saves all humanity.