Pesky Fly is a rush attack used by Dr. Gero. First, Dr. Gero laughs and claws the opponent up into the air. Then, he jumps up to grab the opponent by their leg and throws them away. Finally, Dr. Gero teleports behind the opponent to knee the opponent twice down to the ground, inflicting a great deal of damage.
Dr. Gero uses this attack to ambush Krillin. While the Z Fighters are in pursuit to find Dr. Gero's Lab, Dr. Gero senses Krillin nearby and decides to ambush him. He fires an energy wave at Krillin's direction, but ends up blasting some mountains, which creates an explosion and harms the nearby animals. When Krillin flies over to the sight of the explosion, Dr. Gero ambushes and attacks Krillin with the "Pesky Fly" rush, injuring and knocking him down to the ground.