Dragon Ball Z: Cooler's Revenge Episode 1

Gokuu Son and his friends are out camping when three mysterious enemies ambush them. After a quick fight, a fourth enemy named Cooler joins the fray. Seeking retribution for his younger brother Frieza after he was defeated, Cooler attacks Gokuu; however, the latter manages to escape with Gohan Son and goes into hiding. Unsatisfied and infuriated with the outcome, Cooler and his men begin the hunt