The Unbeatable Enemy Within! Goku vs. Android 19!
The Unbeatable Enemy Within! Goku vs. Android 19! (Attacked on Both Sides by an Internal Enemy?! Son Goku vs Artificial Human #19) is the sixtieth episode of Dragon Ball Z Kai. The episode first aired in Japan on June 6, 2010. Its American air date was March 9, 2011.
As Goku, Piccolo and Tien Shinhan take the Androids to a new location to battle, Krillin revives Yamcha with a Senzu Bean. However, once Yamcha reveals the androids' ability to absorb energy, Yamcha, Krillin and Gohan head off to warn the others.
Meanwhile, it is revealed to Goku that the androids are a result of years of research conducted by Dr. Gero, in which miniature spy robots were used to analyze Goku's fighting techniques and developments in strength, all in an attempt to exact revenge on Goku for destroying the Red Ribbon Army.
As a battle ensues between Super Saiyan Goku and Android 19, it becomes evident that Goku is losing the upper hand, especially once the android absorbs the ki from Goku's Kamehameha. Gohan then reveals that Goku never became sick from the heart virus (as was predicted by Trunks), and that it seems to be affecting him now, six months later than predicted. As Goku struggles to fight, Android 19 prepares to finish the battle by absorbing Goku's remaining energy.