The Fantastic Journey
While on a research expedition to further man's knowledge of the sea, a scientific party traveling aboard the ship Yonda is engulfed by a billowing green cloud as it passes through the Bermuda Triangle. The ship and its passengers are mysteriously marooned on a forbidding, uncharted island.
There they meet Varian, a man from the 23rd century, who tells them that they have passed through a time warp and are in a seemingly endless land where the past, present, and future co-exist. They also learn that other people from other times also exist on the island -- people who pose a constant threat to their safety.