Alpha Child (1974)

jackie crawford, alpha's first newborn, looks healthy but within minutes reaches the apparent age of five. despite the enigma, the entire base affectionately welcomes the newcomer, except his mother cynthia and commander koenig, who perceives a hostile intent in the child. these, in spite of his deafness, seem to quickly learn everything about the customs of the earthlings. when four large spaceships are positioned above the base, jackie resumes growing and becomes jarak, head of a race of menacing aliens.