There’s no chemistry between the two actors at all - they don’t even kiss but press their lips together in a listless display of dead emotions. So the whole premise of a love that makes one of them dare to cross the gorge to fulfill their love’s desire is - ludicrous.
The intro to get the plot going is tedious and long winded. The plot: a biological weapon’s mishap that nevertheless remains contained in a gorge that prevents mutant plant-anmals from escaping, if the two lone guardians on opposite sides of the gorge’s rim can prevent them mutants from scaling the cliffs of the gorge. But! A river is running through the gorge (even the characters at some point mention the fact that the gorge must have an exit and entrance somewhere where the river exits/enters the gorge offering an escape route even for the mutants)) - it makes no sense.
The creatures are left busying themselves with occasionally scaling the gorge’s cliffs in their attempt to overrun the lone protectors of mankind on opposite sides of the rim, but fall prey to the limitless ammunition that the two main characters unload on them.
The two characters fall in love by writing messages on white boards they read through their high powered binoculars, until one of them (the guy, of course) dares to zipline across to the other side to fulfill that longing desire for which there is no evidence in the acting.
Then boy falls into the gorge, girl comes to the rescue, they shoot a million mutants, climb back up to the rim — and saved! Also, note that it gets tiresome to have a women weighing about 100# and showcasing the athleticism of a newborn giraffe throw kicks and punches that shatter whatever she hits.
But of course, in the end, it has to be an atomic weapon that kills them mutants and the villainous Sigourney Weaver. It’s a ridiculous movie.