(The original name of this movie is "The World's Strongest Man")
The second Dragon Ball Z movie is a much more entertaining movie than the first. And like most of the DBZ movies, it doesn't fit within the DBZ series timeline.
The story starts off with Gohan and Oolong in a frozen wasteland. Oolong brought Gohan with him to help find the Dragon Balls so he can wish for...well, let's just say that Oolong is a pig in both the literal and figurative sense. Anyways, befoer they can find the Dragon Balls, somebody else has already gathered them all and summons Shenron, asking him to melt the ice and reveal an old labratory that was frozen.
Some rather evil looking monsters attack Gohan and Oolong, but Piccolo, who happened to (conveniently) be in the area rescues them, but in the process is attacked and disappears. Gohan and Oolong return home without the Dragon Balls but decide to keep their little adventure a secret.
Later on, a rather odd looking submarine appears at the Kame House and a rather odd looking scientist asks for Master Roshi, calling him the "strongest man on earth." Roshi puts up a good fight when the scientists minions attack, but they take Bulma hostage, so Roshi reluctantly goes with them.
When Goku learns of this, he rushes off to rescue Master Roshi and Bulma. And when Chi Chi isn't looking, Gohan takes off too.
I actually liked this movie quite a bit. The action is a little better than the first movie and of course as always with DBZ the animation is awesome. This movie is a definite good buy. There is a tiny bit of mild cursing, but other than that it is fairly OK for everyone to watch.