The Blue Yonder (1985)

A young boy longs to connect with the grandfather he never met, and his wish comes true when a friend invents a time machine. Traveling back to the past, he quickly realizes that his insights into the future might alter significant historical events. As he navigates this new world, the stakes rise, and he must confront the potential consequences of his actions on the timeline. The adventure blends nostalgia and imagination, highlighting the delicate balance between past and future.