Mutant birth, the

A woman abducted in 1955 mysteriously reappears out of a ripple of white light that marks the doorway between the earth plain and a plain on the continuum. It's present day, but the girl still looks the age she was when she was abducted. She is heavily pregnant, abnomally so and fortunate enough to be found by a passing highway patrolman. Somethingfollows her from out of the light, the unborn child's father, only he isn't human.