While most parts were recast, including Tia and Tony, Eddie Albert returned to play Jason O'Day from the original 1975 film.

As they catch up to him in the woods, Deranian and Foreman, henchmen of billionaire Aristotle Bolt, shoot tranquilizer darts toward the trio in an attempt to capture the children.

In a vision, Bené discovered that his grandson, Gregory, also a survivor from their lost world, used his telekinetic powers to move a log across a river to save drowning children.

They reunite with Jason, who reluctantly agrees to help them find and return Gregory to Witch Mountain, after Tony reveals that Bolt is again pursuing them.

The children begin walking towards the colony, but Tony and Tia decide that they should seek out other survivors from their world, and bring them home to Witch Mountain.