Dr. Gero is eliminated by his own creation, Android 17.
This episode is often cited by fans as the moment the threat level shifts from Dr. Gero’s "energy absorption" models to the far more powerful and unpredictable "infinite energy" models that Trunks feared. Android 18 fight that follows? Goodbye Doctor Gero! - Dragon Ball Z Episode 134 Reaction Dragon Ball Z (Dub) Episode 134
Following his retreat to his mountain laboratory, Dr. Gero (Android 20) is forced to awaken his most dangerous creations, and Android 18 , to defend himself against the Z Fighters. However, the situation quickly spirals out of his control: Gero’s "energy absorption" models to the far more
The trio of androids decides to ignore the Z Fighters for the moment, setting their sights on their primary objective: finding and killing Goku . - Dragon Ball Z Episode 134 Reaction Following
Trunks, having arrived at the lab, identifies these as the ruthless androids from his future timeline. Despite Gero's threats to deactivate them, Android 17 destroys the remote control and subsequently kills Dr. Gero , decapitating and crushing his head.
This episode marks the first appearance and activation of Android 16 .