Explorers (1985)

A boy obsessed with 50s sci-fi movies about aliens has a recurring dream about a blueprint of some kind, which he draws for his inventor friend. With the help of a third kid, they follow it and build themselves a spaceship. Now what? The visionary dreams of three curious and adventuresome young boys become an exciting reality in Explorers, the action-fantasy from acclaimed director Joe Dante (Gremlins), who combines keen humor, warmth and fantasy with unexpected twists. In their makeshift laboratory, the boys use an amazing discovery and their ingenuity to build their own spaceship and launch themselves on a fantastic interplanetary journey. A galaxy of adventure for the whole family, starring young River Phoenix (Stand By Me) and Ethan Hawke (Gattaca). Dreaming of space travel, a teenage science whiz and his best friend create an interplanetary spacecraft in a homemade laboratory.