Great book ruined by a terrible director.
Heinlein's original novel is a well paced and quite innovative horror/thriller, and the fact that Stuart Orme, the terrible director who shot this film, ruined it really pisses me off.
There are a few good scenes that got kept, such as the beginning with the agents discovering the alien at the TV station and Sam's interrogation by his father. Sutherland nails the 'Old Man' part, and if everyone else had been as good as he was, I'd be ecstatic. No such luck.
I don't understand why this terrible British TV director was allowed anywhere NEAR a classic like Heinlein.