Ok so I don’t remember much at all. Definitely rented this film on dvd in the late 90’s or early 2000’s. All i remember is there’s this little kid accompanied by a teenage girl and boy. The little kid(a boy) might have a backpack and definitely has a toy Bionicle with him.
As for the plot I haven’t a notion, i vaguely remember someone chasing after them so I assume they’re trying to get away from the “bad guys”.
I’m just gonna guess “The Wizard”
http://www.people.com/article/the-wizard-25th-anniversary
There’s also “Josh and S.A.M.”
http://www.imdb.com/title/tt0107277/plotsummary