A teenage son of an astronaut tries to help his father after he and a chimpanzee switch brains as the result of a space flight mis-hap in which the boy must protect the "chimp" in which his father and is unable to communicate with anyone vocally, plus his father with the chimp's mind from the military personnel and anyone else.
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[explaining to Jessie how the machine works to switch his dad and Orville's mind back
... The circuits control the flow, and Dad and Orville sit here. The whole thing re-creates what happened in space, then I press this
[shows Jessie a hand-held button
and bang! Maybe, it all works.
Or, bang! Maybe we blow up Houston.