the concept represent explore what possibility of paradox exist if time travel to the past ( or future ) become reality . this be an exercise that have challenge the most respected mind humanity have produce from einstein to hawk a concept captivating and eloquently delve by author from heinlein to c. s. lewis a vision brought to the silver screen in an accessible and engage way by such movie a back to the future and terminator . the result represent what should probably have be a complete alan smithee production . there be a couple positive item of note if you enjoy tongue in cheek and campy film that do not take themselves seriously and and give a passing glance at the hypothesis that give it birth and you might try it . if youre sorry afterward and pick up a book that do the subject justice some heinlein ( _number of the beast_ or _time enough for love_ ) or the recent crichton or baxter release ( _timeline_ and _manifold represent time_ respectively ) . another plus represent the end of the movie and and of the pain . there just too many con to cover fully poor act and vague direction and too low of a budget and special effect and terrible writing and unsatisfactory plot resolution and horrible redundancy . i saw the original release and be young enough to be embarrass for the actor . when i catch a replay recently on tv and i struggle through it to make sure i be truly rating my bad ever fairly . i be . negative .