Goku learns a lesson in speed thanks to a friendly cricket named Gregory. He then learns the history of the hostile planet Vegeta, and finally completes his training under the aegis of King Kai. As Goku reviews what he has learned, Team Dragon Ball likewise wraps up its own training at Corin Tower. First telecast in Japan on September 20, 1989, "The Legend of the Saiyans" introduces the martial-arts techniques "Kaio-Ken" and "Spirit Bomb"; American viewers would have to wait until January 17, 1997 for this twin revelation. ~ Hal Erickson, Rovi