I enjoy cheesy 80's science fiction-esque films, and don't demand anything more then a fun vibe from them, but this film isn't all that fun, and feels cheap. Characters and their relationships are developed poorly at the film's start, they form as they do without much explanation. In an effort to find a science project to pass his class, a boy finds a gizmo in a junkyard that causes disruptions in the time continuum and leads to havoc and his science teacher disappearing. Dennis Hopper as the teacher is fairly amusing in some moments (but he's enjoyable in anything), and Fisher Stevens as the slick oddball friend of the main character delivers an overload of bad wise-cracks throughout the film, which oddly and kind of unfortunately, becomes one of the more enjoyable aspects. The rest is a display of potential going down the drain. The film cheaply avoids locations and makes the time disruption take place in the high school, where Vietnam soldiers, aliens, warriors, etc. come out. Nice special effects and prod. design here, but its just encounter after encounter with the high schoolers taking them out with weapons one after one. It's not exciting at all really, and feels restricted with little else to do. If time travel was involved, sure, but restricted to a high school, there's nothing to do, and the film falters. By the end, its disappointing with little to attain from it. It has it's 80's charms here and there, but with many science comedy offerings out around the same time period that were far better like Weird Science, I can't recommend this at all. Forgettable.