Later, at the site of a plane crash, another alien takes over the body of a dead pilot, goes to a hockey game, chokes the announcer, and issues an ultimatum for the Earth to surrender.

With the jamming signal silenced, Dr. Penner is then able to contact the government and tell them how to stop the aliens, while Phyllis tends Bruce's wound.

According to author Randy Palmer, "To help camouflage the costume, optical effects were added to lighten the image and give it a distinct blur, so that it's very difficult to tell that the invader's true form matches that of (Blaisdell's) Martian Lizard Man".

"A great flurry of stock shots" were used "as the invaders smash things all over the world – fires, quakes, buildings collapsing, dams bursting".

[4] Footage shot for the film itself was also repeated, with scenes re-used of the invisible alien making parallel grooves in the dirt as it shuffles toward Dr. Noymann's grave and then pushes aside some bushes.

[4] The movie ends with the narrator proudly saying that in the face of a planetary threat, all the people of Earth will unite against a common foe.

[8] In the UK, it received an "A" certificate from the British Board of Film Censors on June 15, 1959,[9] which allowed it to be shown to "children accompanied by anyone over 16".

[10] To drum up domestic interest in the film, Variety said in its "Exploitips" listing that "the attention-getting title is the chief selling point - a ballyhoo man dressed in a rented space suit ... will get notice from neighborhood youngsters".

Kiss "gives some interesting data on the film's 1959 release and exhibition history, noting how it was almost always shown as the second of a double feature, quickly shifting from one-week runs to bookings of only a couple of days".

[18] Writing in The Zombie Movie Encyclopedia, academic Peter Dendle said, "Though clearly a product of its own time and a low budget, Invisible Invaders is engaging and fast-paced, riddled with genuinely inspired twists alongside breathtaking implausibilities".

"[20] The film is described on Turner Classic Movies as "the inspiration for Night of the Living Dead," noting that "the severe lack of funds obviously influenced the producer's decision to make the aliens invisible.

"[21] Writing on DVD Talk, critic Adam Tyner noted that "Invisible Invaders doesn't exactly hold up to scrutiny," that the film's "pace is this side of glacial," and that "there's nearly as much narration as there is actual dialogue.

[23] The film was released on DVD by MGM Home Entertainment in 2003, packaged with Journey to the Seventh Planet as part of their Midnite Movies series.

[24] The Blu-ray edition, released in July 2016 by Kino Lorber, featured a full-length audio commentary by film historians Tom Weaver and Dr. Robert J.

Dunlap would later use much of the same music in three other science fiction movies: The Angry Red Planet (1959),The Three Stooges in Orbit (1962), and Destination Inner Space (1966).