The main character's arch enemy is his son who seeks revenge against him because he won the title of Earth's protector. He abducts Son Gohan, gains eternal life using the dragon balls and finally faces off against Goku in a final battle.
Note: Dragon Ball Z: Dead Zone, originally released theatrically in Japan as simply Dragon Ball Z and later as Dragon Ball Z: Return My Gohan!! for its Japanese VHS and Laserdisc release.
Hironobu Kageyama