A group of secretive scientists develop time travel near Idaho’s Craters of the Moon, discovering a near-future apocalypse. Since anyone much over age 20 can’t survive traveling, they’re in the process of sending a group of young people, including Isa and her withdrawn sister Karen, beyond the apocalypse to rebuild civilization. Things go wrong (not the least of which are the plot, the dialogue, the acting, the sound track, and the requirement that the young Jane Fonda lookalikes must strip to travel through time), but even so, the film has a certain unprepossessing appeal.