Have you ever thought of traveling through time... going forward or backward to any date? That's the intriguing question aviator/inventor Max Knickerbocker (E.T's Peter Coyote) asks 11-year-old Jonothan Knicks (Huckleberry Fox of "Terms of Endearment"). Max is unaware that Jonothan is his grandson - already an adventurous time traveller thanks to a machine built by his neighbour, Henry Coogan (Academy Award-winner actor Art Carney). Can Jonathan save his grandfather from a fatal solo flight across the atlantic and alter the course of history?