4x1 - Dragon Ball Z: Dragon Box

Goku confronts the Artificial Humans, who wound Yamucha and mercilessly destroy the city around them, and becomes enraged at their actions! They decide to move the battlefield to another location and have it out. The Artificial Humans tell Goku that since Doctor Gero manufactured them after observing all of Goku's fights up to now, their force is without fail greater than his.