Bloody teenagers - always drinking magic potions, growing to huge proportions and taking over villages.  Back in my day we were content to be werewolves.

Unlike most real-life experimental drug trials, the kids don't seem to suffer any negative side effects.  Well, apart from the way they move v-e-r-y s-l-o-w-l-y. 

Apparently Happy Days veteran and big-shot director Ron Howard plays the genius who makes the growth potion, but I couldn't spot him in the trailer.  Interestingly, this film was directed by Bert I. Gordon who seemed to specialise in making movies where things were too big or small.  He was probably a midget or a basketball player.

Favourite bit:  The ridiculously spindly fake giant legs which the woman on the motorbike winds a rope around.