Ep. 14: An All-Out Kamehame-Ha! Vegeta's Terrible Transformation!

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Goku powers up with the three-times Kaio-ken and attacks Vegeta with his increased power and speed. Vegeta is filled with rage as he realizes that Goku's power level exceeds his own, so he powers up even further and attempts to destroy Earth with his Galick Gun technique. Goku counters this attack with his Kamehameha blast, and when it turns out that they are evenly matched, he uses the four-times Kaio-ken to overcome Vegeta's blast, sending Vegeta flying into the outer atmosphere. Vegeta then searches for the moon to transform into a Great Ape and increase his power level. Realizing the moon has been destroyed, Vegeta releases a ball of ki that simulates the moon, and absorbs its Blutz Waves to transform into a Great Ape, which multiplies his power level by 10 times in the process. Krillin and Gohan sense Vegeta's increased power and decide to return to help Goku. (Source: Wikipedia)