While a hunting guide takes a big-game hunter into the wilderness, his dead son comes back to life to terrorize three female campers.

Jimmy, a young boy trying to gain acceptance from his peers, is horrified when he sees a circus trainer abusing a bear cub. One of the circus employees tells Jimmy that there is a magic cave in the hills nearby that can transport people to another time, and that maybe he can use it to help the bear. Jimmy does some exploring, finds the cave, and is amazed to find himself transported back to the early 1800's where he encounters Jeremiah, a nature-loving mountain man with a bear friend of his own. Jeremiah agrees to come to the future and help out Jimmy, but the 21st century is quite different from the 19th, and springing the bear cub will not be as easy as Jeremiah thinks. Not in any way related to the "Grizzly Adams" television series.

Present-day Portland suburbs kids Dylan and Nicole go on the camping trip with their family, and when they enter a mysterious cave in the mountains, they're transported back in time to 1870, where they meet mountain man Jeremiah.

An eccentric mountain man on the run from the local sheriff recalls the mysterious events that brought him to his present fugitive state.

The story concerns two grizzled mountain men -- Bill Tyler and Henry Frapp -- during the dying days of the fur-trapping era. The plot begins when Running Moon runs away from her abusive husband Heavy Eagle and comes across the two seedy fur trappers. The mountain men take her in, unaware that Heavy Eagle has dispatched an army of Indian braves to reclaim her.

A mountain man who wishes to live the life of a hermit becomes the unwilling object of a long vendetta by Indians when he proves to be the match of their warriors in one-to-one combat on the early frontier.