This review may contain spoilers. I can handle the truth.
Plot hole haiku:
It can only walk?
Fly to Australia today.
It cannot follow.
I just saw the director's working cut of this film back when it was to be named 'The Ancestor'. Apparently Dan O'Bannon did not have creative control over the theatrical release. The working cut, although lacking music and some special effects, seemed like a smart adaptation of H. P. Lovecraft's The Case of Charles Dexter Ward.