Ben Crandall is a young teenage boy living in a fictional
Maryland suburb, who experiences vivid dreams about flying through clouds and over a vast, city-like circuit board, usually after falling asleep watching old sci-fi films. Upon waking from the dream, he draws a diagram of the
circuit board and shows the sketches to his friend, child prodigy Wolfgang Muller. At school, Ben develops a crush on Lori Swenson but is unsure whether it is mutual. The boys also befriend punkish-but-likable Darren Woods, with whom they share their circuit-board concepts. Wolfgang builds an actual
microchip based on Ben's drawings. The chip enables the generation of an electromagnetic
bubble which surrounds a pre-determined area. The boys discover that the bubble is capable of moving at near-limitless distances and speeds without ill effects from
inertia. Due to Darren’s connections at a local junkyard and his mechanical skills, the three boys construct a rudimentary spacecraft out of an abandoned
Tilt-A-Whirl car and name it
Thunder Road, after
Bruce Springsteen's
song of the same name. After Ben receives more dreams about the circuit board, Wolfgang discovers a means of producing unlimited sustainable
oxygen; this means longer flights, whereas previously they were limited to whatever a typical oxygen tank could hold. They finalize their plan to explore the galaxy in search of alien life. The boys complete lift-off, despite interference from the authorities (one who silently wishes them well). Shortly after breaking Earth's orbit, something overrides the boys'
personal computer-controls.
Thunder Road is beamed light-years away into deep space and is tractor-beamed aboard a much larger spaceship. The boys venture out to meet their "captors", Wak and Neek: two
aliens whose knowledge of Earth comes almost entirely from pop culture, particularly TV reruns. The young explorers hit it off with their alien hosts, but then the alien ship is suddenly intercepted by a larger alien ship. Wak urges the boys to leave. They are in the process of doing so when they are interrupted by a gigantic alien who admonishes Wak and Neek. It is revealed that Wak and Neek are brother and sister, and the gigantic creature is their father; they have taken his ship out for a "joy ride", sending the dreams to the boys in the hopes of meeting humans. Transmissions of old movies have kept the alien populace at a distance – except for the curious Wak and Neek – due to the way humans depict violence toward alien life. Wak and Neek's father allows "Thunder Road" and its crew to depart, after Wak and Neek give the boys a parting gift: an amulet, which, according to the aliens, is "the stuff dreams are made of." The boys make it safely back to Earth, but a malfunction results in them crashing "Thunder Road" into a lake. A week later, Ben has a dream at school in which he envisions another vast circuit board while flying through more clouds overhead. This time – thanks to Wak and Neek's amulet – Ben is joined in the dream by Wolfgang, Darren, and Lori. They note the circuitry's complexity and speculate where it may take them once completed. Lori smiles at Ben while holding his hand, and they share a kiss while flying. ==Cast==