Dragon Ball Z Movie 01: Ora no Gohan wo Kaese!! (Dub)

Piccolo is training at a barren cliff when a handful of mysterious enemies attacks and defeats him. These same enemies then go to Mount Paozu to steal Gohan Son's "Dragon Ball." Upon arrival, not only do they defeat Gokuu Son's spouse and father-in-law—Chi-Chi and Gyumao, respectively—but they also kidnap Gohan in the process. Feeling something isn't right, Gokuu rushes home, only to find Chi-Chi lying on the ground as she explains the situation. He then goes to Kame House and borrows the Dragon Radar in order to locate the Dragon Balls and, with them, the enemies and Gohan. Kami-samas old nemesiss son has come to exact revenge on Kami-sama for winning the title of Earths Guardian. After kidnapping Son Gohan and using the dragon balls to gain immortality, he has a final showdown with Goku.