Ethan Hawke portrays Ben Crandall, a curious and imaginative young boy who dreams of space exploration.
River Phoenix plays Wolfgang Müller, a genius and resourceful friend who helps build the spacecraft.
Jason Presson takes on the role of Darren Woods, a fun-loving and adventurous member of the group.
Amanda Peterson is Lori Swenson, a supportive friend who joins the boys on their interstellar journey.
Bobby Fite appears as Steve Jackson, a member of the group who joins the adventure into space.
Dana Ivey portrays Mrs. Müller, Wolfgang's mother who becomes involved in the friends' exploration.
Bradley Gregg is part of Steve Jackson's Gang, adding to the adventurous spirit of the group.
Georg Olden joins Steve Jackson's Gang in the film, contributing to the dynamics of the group of friends.
Chance Schwass is another member of Steve Jackson's Gang, taking part in the exciting journey into space.
Danny Nucci plays the Nasty Kid at School, a character who adds some conflict to the group dynamic.
Taliesin Jaffe portrays Ludwig Müller, a family member of Wolfgang who gets involved in the friends' adventure.
James Cromwell appears as Mr. Müller, another family member who plays a role in the storyline.
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