Justice League Z
A crossover between Dragon Ball Z (Anime Series) and the Justice League (Animated TV Series).
In the DC universe, an exploration on Mars causes an ancient alien civilization to be accidentally released and it is going to invade Earth. DC's Earth is going to need its heroes to repel the oncoming invasion, and due to certain circumstances, one of the strongest beings from the DBZ universe ends up crossing over to the DC universe. DC's Earth is in for a big surprise!