一个普通男人的秘密在他的辞职事件中开始显示出端倪。历史教授约翰奥德曼（David Lee Smith饰）说自己身上有一个让大家都匪夷所思的秘密，而为了保守这个秘密他不能在一个地方超过十年。他的朋友们试图去发掘他的故事中的秘密，这一举动让约翰非常生气，而他的朋友却发现约翰的故事是无法被否定也无法查证的，究竟约翰身上有着怎样的秘密？一幕幕碎片联系起来，带给我们一个意料之外的故事高潮。

　第一部利用微缩科技深入人体拍摄的科幻片，也是《惊异大奇航》的前身。故事描述一名苏联科学家从银幕逃到美国，因为他的脑血管遭到间谍破坏而命在旦夕。五名美国医生乃被缩小成几百万分之一置于胶片中，注射进科学家体内进行血管手术。本片构想新颖，为科幻片题材开创了新天地。人体内部景观的映象效果不乏取材性，可惜六十年代的电影特技仍未够高明，今天看来不免使观众对于某些布景感到可笑，不过并不影响本片丰富的娱乐性。导演理查德．弗莱尔叙事流畅，曾获最佳艺术指导和最佳视觉效果两项金像奖。

电影由乔治·米勒、乔·丹特、约翰·兰迪斯和史蒂文·斯皮尔伯格四位导演所拍摄的四部短片所组成。
某一天，种族歧视者比尔（维克·莫罗 Vic Morrow 饰）乘坐着时光旅行机回到了过去，可是，在那里等着他的，却是被歧视和侮辱的可怕命运。
没有人知道布鲁先生（斯加特克罗索斯 Scatman Crothers 饰）从哪里来，他又有着怎样的过去，人们只知道，这个神秘的男人拥有能够让人返老还童的奇妙魔力。
海伦（凯瑟琳·奎南 Kathleen Quinlan 饰）遇见了名叫安东尼（Jeremy Licht 饰）的男孩，在他平凡的外表下面，隐藏了一个惊人又残酷的秘密。
没有人相信神经兮兮的瓦伦汀（约翰·利特高 John Lithgow 饰）的所言所语，因为他竟然声称一只巨大的怪兽出现在了半空中将一架飞机撕成两半，然而他的话真的只是胡言乱语吗？

Out of the fifties 'B' Science-Fiction monster movies, this easily ranks as the best. It's most notable as the film that ALIEN is an unaccredited remake of, thus giving it a certain historical significance.
The intriguing plot is about the rescue of the only marooned survivor (Col. Carruthers) of an ill-fated expedition to Mars. The authorities, pig-headed as usual, falsely assume that he murdered his fellow crew members, so that he'd have more provisions to survive; hence he is being brought back to Earth to face court-martial for murder. (There is also a somewhat interesting plot reversal here: Most movies of this nature usually begin with the ship leaving Earth, enroute to its otherworld destination, while, in this case, the "story" is believed finished, and begins as the characters take-off from the other planet, returning to Earth). As the rescue ship is leaving Mars, a lurking, ominous shadow is seen in the lower compartment. (A frightening, atmospheric moment, accomplished through sheer economy and simplicity).
Carruthers insists of his innocence to his fellow captors, claiming that his original crew mates were slaughtered by a hostile, unseen presence on the desolute red planet, but three-guesses as to their reaction to his unusual plea. Naturally, he can't prove it, and 50's space authorities were not very alien conscience at the time. (As a side-thought, "unseen menace" may remind you of that highly "original" BLAIR WITCH).
As everyone sacks out, a hapless supporting charactor whose name is at the bottom of the casting list (guess what will happen to him?) hears something in the lower compartment. Despite your futile "don't go down there, you jerk!" pleas, he does just that, and is appropriately killed (more like thoroughly obliterated) by the shadowy figure with insatiable blood lust on its mind. In the victim's case, dereliction of duty and sheer cowardliness would have been the wise decision. The scene is actually well-directed (for a change) and develops much suspense, as the entire film surprisingly does.
The crew finally catches on that they have an unwanted ship crasher on board, and try every possible means at their disposal to eliminate it, but the unknown creature seems to copping an anti-death attitude. Proving to be an even more clever, worthy adversary, 'IT!' also hides out in the ventilation shafts of the ship (now that should ring a bell). Cahn's forceful direction generates considerable tension as the malevolent stowaway works its way up from one level of the confined ship to the next, eventually leaving the remaining characters trapped at the top. The movie's suspense is blunt and right to the point: "IT!' has to kill them or starve, hence they have to kill "IT!" or die. Nothing like those "no two ways about it" choices. Rent it, or check for it on cable if you wish to know the outcome.
For a low-budget quickie, IT! is quite impressive and memorable. The dreaded sense of claustrophobic tension, rendering the characters' helpless entrapment, is highly effective. This is a production in which the limited budget and small sets actually work in favor of the plot's scary ambience. The black & white photography (Yes, it's one of those!) helps to enhance its dark, creepy mood, and the sense of apprehension is quite high. (Modern day color freaks never seem to take that into consideration). The plot is also somewhat cynically ironic: If the creature hadn't stowed away on the ship, Carruthers would have most likely been found guilty of the charges against him.
The intelligent script (see what I mean about "rareity") was penned by noted Science-Fiction author Jerome Bixby (remember Twilight Zone's "It's a Good Life")? The picture's taut editing eliminates any extraneous dross. (ALIEN tended to drag in its first hour with its sophomoric dialogue, and why did it have to include that stupid and ultimately counter-productive sub-plot of Ash being a robot, and further dragging the story down to another big bad conspiracy cliche? UNNECESSARY!!!)
Director Cahn astutely keeps the rubber-suited monster off-screen and in the shadows through-out most of the proceedings, keeping your paranoid imagination on constant alert. Unfortunately, perhaps at the studio's commercial insistance, it is a little over-revealed at the climax, but I haven't claimed this to be the perfect masterpiece. The performances, though nothing award-winning, are nevertheless cool enough so that one becomes sincerely concerned as to their fates. Not many movies in recent times ever come close to achieving that. They can be over-produced from here to eternity, and usually only succeed in being gloriously annoying.
This film's story is not really totally original (what is?), for it is based on A.E. Van Vogt's "VOYAGE OF THE SPACE BEAGLE." All ALIEN fanatics should track down an old used copy to see where the initial influence came from.
As long as you're not craving another CGI wind-ding, you may find it worthwhile. Just don't expect the women to be Ripley precursors. This was still the sock-knitting fifties, sad to say.

A missile from parts unknown enters an orbit only 5 miles above Earth's surface and, due to friction from its intense speed through our atmosphere, proceeds to incinerate everything in its immediate wake.