Bruce Eder sums up this movie quite well. As Eder points out, elements of The Invisible Boy, like the super computer that wants to take over the world, would be seen in later movies, like Colossus: The Forbin Project. And the fact that Robby the Robot (from Forbidden Planet) time travels back to 1957 is so understated, and the scientists and boy’s family so unimpressed by Robby, and the boy’s smarts in putting him back together, it’s kind of funny and sad and intuitive as to 1950s sentiments on child-rearing and American atomic age insouciance and superciliousness rolled into one. At the heart of the story is a boy who just wants to be able to play and have fun. Given that MGM wanted a movie vehicle to re-use Robby, since he cost so much to build, may have rushed the script into less-than-polished as it should have been; but Cyril Hume and Edmund Cooper manage to add some food for thought while keeping it at a juvenile level for the matinee kids.
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