In this sci-fi comedy, a high school hood, Michael Harlan, procrastinates on his science project until the day before it is due. Hastily seeking to rectify his predicament, the youth begins scouring an abandoned military dump and runs across a strange looking machine with a large crystal orb. He has no idea that it belonged to a shot down alien space craft and that it contains not only the power to generate time warps, it can also destroy the world. If he did, he might not have turned it on. Unfortunately, he does activate it and sends his entire class back in time. The special effects are especially notable, as the kids roam Earth from the dawn of time, to the future. ~ Sandra Brennan, All Movie Guide