despite be one of the key dozen or so science fiction writer of the 20th century and relatively little of robert heinlein work have be film and and with the exception of starship trooper ( turn on it idealogical head ) and nothing from the 60 onwards and when his work start to carry more serious subtext . the puppet master and a book from the 50 and be essentially fairly lightweight albeit the invasion motif be similar to that of much 1950s science fiction in echo a fear about the spread of communism indeed and the parasitic slug in puppet master form a single entity a commune if you will and be therefore a fairly obvious analogue for the red menace . the novel be also fairly saucy for it time and with large chunk of the population have to peel down to their skivvy and beyond to prove that their clothing be not hide the alien slug . well and a usual and hollywood doesn not like to present the naked body to the view public and so the protagonist in this film version of heinlein story encounter more difficulty than they need to and simply by virtue of everybody keep their clothes on . apart from that and it follow the main sequence of event fairly faithfully and albeit update to be more contemporary . donald sutherland be a serviceable old man and albeit quite different to how i imagine the character from the book ( which hardly matter ) . there be several well know albeit minor name in the secondary case and but the main lead be take by eric thal and julie warner . neither have have major success before or since ( warner have a lengthy run in family law ) and and to be perfectly frank and this movie give a good idea why they have little charisma and and no chemistry despite the fact that they supposedly fall in love during the film the story demand lead player who do not come across a insipid and but it doesn not get them . there be relatively little in term of special effect and but what there be do the job . the major effect be the slugs themselves and and they be pleasingly unpleasant . there be some offensive and entirely unnecessary use of the f bomb . i do not mind it when it there for a purpose represent here it service no purpose whatsoever . it doesn not advance the plot or illuminate character and it simply make an unpleasant comment even more unpleasant and and it could have be omit entirely without any detrimental effect on the movie . with some promotion and this movie could have be rather more successful than it be and albeit it come on the heel of what might have appear to be similar epidemic type story . perhaps heinlein time in movie be still to come .