Very very predictable, including the post credit scene !!!

Such a frustrating disappointment

The film never slows down or bores, plunging from one harrowing sequence to the next.

The story, direction, characters, and writing/dialogue is akin to taking a tranquilizer shot to the neck, but everything else was so well done.

There is an oil rig in the middle of nowhere.Its staff is looking for oil but their mission is secret.A company geologist played by Joseph Bottoms is looking for alternative oil sources.One day he finds a bunch of small eggs.And creepy looking snake creature,who bites young worker prompting him to die.Whilst mysterious eggs are researched in the lab various oil rig workers begin to die...First of all I consider Peter Carter's "Rituals" to be one of the best and most fascinating survival horror movies of 70's. Peter Carter's "The Intruder Within" is clearly not as stunning.There are some effective moments of suspense,but the plot is silly as it rips-off "Alien".The creature effects are average at best.The atmosphere of isolation is well-captured,though.6 oil rigs out of 10.

Along the lines of "The Thing", with a touch of "Alien", "The Intruder Within" is no more than a mediocre creature feature. The boredom of an isolated oil drilling rig crew is translated to the screen as mostly boredom for the audience. Over 19,000 feet down, the drill encounters an unknown life form that is fascinating to the on board scientist. Where have you seen that before? Pick any similar monster film. Interestingly there are only good looking women working on the rig, one of whom is date raped by the undersea intruder. The beast itself goes through an all too familiar metamorphosis from hand puppet to man in rubber suit. Overall the movie lacks tension, and is loaded with way too much meaningless dialog. - MERK

I must admit that I really like this jarringly harsh and downbeat made-for-TV "ALIEN" copy. This time the rugged roughneck crew of a remote off-shore oil rig are terrorized by a large, scaly, fanged, lumbering centuries old humanoid beast dredged up from the ocean floor. Sure, the plot ain't much, but Peter Carter's crisply proficient direction (Carter previously gave us the superior and underrated Canadian "Deliverance" variant "Rituals"), the strikingly gloomy, fatalistic tone (the first victim is a panicky guy who had a nightmarish premonition of the impending disaster), a terrific, rousing score by the chronically unsung Gil ("A Cold Night's Death," "The Ultimate Warrior") Melle, several shockingly brutal violent episodes which really test the limits of what you can get away with in a TV movie (one luckless woman gets raped and dies giving birth to a brawny, fully grown man-sized monster!), the unusually well-drawn and engaging characters, and the cool creature design by James Cummins and H. R. Giger turn this unassuming little number into a modest, but surefire winner. Chad Everett as the hard-nosed crew chief has the right tough stuff to cut it as a fine hero, while Joseph Bottoms, Jennifer Warren, Matt Craven, Lynda Mason Green and especially the ever-personable Rockne ("Black Sampson") Tarkington are solid in sturdy supporting parts.

This Film was great It had what an average fright flick whould want. The Disipointment was it was made for T.V. Chad Everett, Jennifer Warren Joseph Bottoms Rockne Tarkington and James Hayden star in this film about a creature that has been drilled up by their oil rig by Antartica. The small creature turns into a monster that begins to kill off the crew members of the Oil-Rig. The film would have been better if it was not made for T.V. and Had more Violence and Gore like PREDATOR and ALIEN did. But the Director failed to commpelte good effort and the monster was Just a costume but dose look frighting. I recommed this film catch on T.V. or Rent it. It is a good clone to ALIEN and Predator. 8 stars out of 10.