It Conquered the World is a rather entertaining cheapie. There are some undeniably silly bits – like the moment during the power-cut when the cop tells the woman to start cranking her husband’s iron lung by hand. However, if one looks beyond the obvious B-budget tattiness you find a surprisingly high level of out-and-out entertainment. Roger Corman directs in a rudimentary way but some of the possession scenes are good – like the moment technician Karyne Kadler wakes up to find her two fellow technicians have been taken over while she sleeps, they going about their usual thing and it not dawning on us until she finds two dead bats in the soft drink machine. There is a wonderful cheesiness to the design of the fanged cucumber creature, which is lit in such a way that its static rubbery features attain a genuine malevolence.

Lou Rusoff’s plot is squarely centred among the clichés of the alien takeover genre – it is not long before the good old Communist analogies are being wheeled out – when the possessed general wants to impose martial law at the base the readiest reason is ‘Communist Threat’. Surprisingly though, Rusoff transforms the takeover themes into a literate war of ideas – particularly good being when it is shown that the creature is manipulating Lee Van Cleef’s idealistic zeal by pointing out that the creature would create a world where such zeal would be forbidden. In one marvellous exchange, Lee Van Cleef insists to wife Beverly Garland: “I’ll still need you even when there are no emotions,” to which comes the reply that belongs to the dialogue prized among B-movie fans, “For a few dollars you can hire a woman who’ll fulfil all your fetishes. And when you get tired of her you can run down to the employment agency and hire another.” The ending contains a wonderfully noble eulogy: “He [Lee Van Cleef] learned almost too late that Man is a feeling creature. And that because of it he is the greatest creature in the universe. He learned too late that Men have to make their own way and make their own mistakes and that there can’t be any gift of perfection from outside ourselves. That when we seek such perfection we only find death, fire, loss, disillusionment, the end of everything that’s gone forward. Men have always sought an end to toil and misery and if it can’t be given, it has to be achieved. There is hope but it has to come from Man himself.” That is a fairly good piece of writing for just a B-movie.

It Conquered the World was later remade by Larry Buchanan as Zontar: The Thing from Venus (1966).

Roger Corman’s other genre films as director are:– Day the World Ended (1955), Not Of This Earth (1956), War of the Satellites (1956), Attack of the Crab Monsters (1957), The Saga of the Viking Women and Their Journey to the Waters of the Great Sea Serpent (1957), The Undead (1957), Teenage Caveman (1958), A Bucket of Blood (1959), The Wasp Woman (1959), The House of Usher/The Fall of the House of Usher (1960), Last Woman on Earth (1960), The Little Shop of Horrors (1960), Creature from the Haunted Sea (1961), Pit and the Pendulum (1961), Premature Burial (1962), Tales of Terror (1962), Tower of London (1962), The Haunted Palace (1963), The Raven (1963), The Terror (1963), X – The Man with X-Ray Eyes (1963), The Masque of the Red Death (1964), The Tomb of Ligeia (1964), The Trip (1967), Gas; or It Became Necessary to Destroy the World in Order to Save It (1970) and Frankenstein Unbound (1990).