Obviously on a shoestring budget, Invisible Invaders uses its title to save every dollar. Aside from a few brief moments during the closing moments, the audience never gets a glimpse of the alien force. As such, the film is a constant grind to watch, almost saved by the venerable '50s sci-fi star John Agar.

Coming in at the tail end of the golden age of sci-fi films, this quickie is chock full of stock footage. Once the premise of unseen aliens taking over the human dead is taken care of, it's non-stop destruction from any source the editing crew could find. This isn't an invasion of Earth so much as an invasion on the audience's time.

Direction here is fine otherwise. Edward Cahn helmed the excellent It! The Terror from Beyond Space a few years prior. Stacks of clichés are here, including the practically useless female character (Jean Bryon) who has little to do than stand around nodding or screaming.

The film has a nice set of rules, until you have a chance to think about them. Obviously, the cast cannot see the threat unless they've found their way inside a dead body. Killing the human doesn't do anything other than send the alien somewhere else.

There's a gaping plot hole at work here. If the aliens are invisible, why even let the population see you at all? Dumber yet, the moon creatures tell a renowned scientist their plan to forward on to officials in hopes of a surrender from Earth. For an advanced race with some incredible technology, these guys are flat out stupid.

Scenes are constantly replayed as the cast takes shelter in what we're told is one of the few remaining safe spots left. Deep underground, the crew begins formulating a counterattack. The solution comes when nearly the entire populace has succumbed to the threat, and is put into effect with a classic 1950s-style finale.

Invisible Invaders ends quickly after the heroes eliminate a few (six at the most) creatures. It never explains how they managed to kick the rest of extraterrestrials off the planet. Given the massive destruction we're led to believe was at the hands of this force, it seems awfully suspect that they were taken down so easily.

Of course, it's rather pointless to pick apart something like this. It's meant to be taken for what it is. In that case, Invisible Invaders is a fairly dull affair. There's little sense that there is any tension, the stock footage is constant and the revealing of the aliens themselves is unimpressive. There are far too many classics from this era to watch to let this one take over your viewing time.