Fantastic Voyage (1966)

Official trailer

Fantastic Voyage is the mid-1960s science fiction film about a submarine and crew miniaturized to microscopic size and injected into the bloodstream of a dying scientist. Richard Fleischer directed. Harry Kleiner wrote, from a story by Otto Klement and Jerome Bixby. Stephen Boyd plays Grant, the CIA agent assigned to protect the mission. Raquel Welch plays Cora Peterson, the technical assistant. Donald Pleasence plays Dr. Michaels, the mission coordinator. Arthur Kennedy plays Dr. Duval, the lead surgeon. William Redfield plays Captain Bill Owens.

Edmond O’Brien plays General Carter, who’s supervising the operation from outside the body. The mission has one hour to find a blood clot in the scientist’s brain and destroy it with a laser before the miniaturization wears off. A process that only works for sixty minutes has miniaturized the crew. It has miniaturized the Proteus, their submarine, along with them.

I get a big grin out of this movie. A submarine shrunk down and fired into a man’s bloodstream is a gloriously silly idea, and the film plays it dead straight with sets I could look at for hours. What keeps it at an 8 for me is the science the script shrugs off and an ending that leaves a loose end hanging.

The film made approximately twelve million dollars on a budget of roughly five to six million dollars. It won the Academy Awards for Best Art Direction and Best Visual Effects. The novelization by Isaac Asimov, written from the screenplay, became a science fiction bestseller. The film is a foundational example of inner-space science fiction and one of the few mid-1960s American science fiction productions to commit fully to its concept.

The Visual Effects

The film’s visual identity is the principal achievement. The interior of the human body is rendered as a series of distinct biological environments, each with its own visual logic. The aorta is a translucent corridor with rhythmic walls. The heart chambers are pulsing red caverns. The lungs are forests of alveoli. The lymphatic system is a pale fluid current. The brain interior is shot in pinks and oranges with floating neurons in the background. Each environment has its own production design and its own threats to the mission.

The lungs are my favorite set in the picture. I think that forest of alveoli is gorgeous, and I’d put it up against anything else the sixties built on a soundstage.

The miniature work, the matte paintings, and the practical effects work together to produce an interior body that feels coherent.

The film doesn’t always achieve photorealistic biology. Some sequences are clearly stylized. The stylization works because the film commits to it throughout. The audience accepts the body as a place with topography, weather, and inhabitants. The choice to render the interior as a navigable environment instead of as an abstract space is the foundational creative decision of the production.

The Hour Limit

The sixty-minute deadline is the film’s structural engine. The miniaturization process wears off after one hour. The crew has to complete the mission and be removed from the body before the wear-off. The deadline produces continuous tension. The audience knows the clock is running. Each delay matters. Each detour is potentially fatal. The script returns to the time pressure repeatedly without making the device feel mechanical.

The decision to make the time limit visible to the audience through repeated cuts to the surveillance room outside the body is structurally important.

The audience can see the clock. The audience can see the surgeons working on the patient. The audience can see the support team’s anxiety. The dual perspective lets the film maintain tension during scenes inside the body that would otherwise feel disconnected from the larger stakes.

The clock is what keeps me leaning in. I like that the film keeps cutting back to the surveillance room, because those anxious faces outside the body make every detour inside it feel like it might kill somebody.

The Asimov Novelization

Isaac Asimov was hired to write the novelization of the screenplay. He produced a book that was published before the film’s release and that addressed many of the scientific impossibilities the film glossed over. Asimov reorganized the body geography to be more biologically accurate. He addressed the question of why the miniaturized crew didn’t suffocate from oxygen molecule incompatibility. He fixed the closing scene, where the crew escapes Benes’s body through a tear duct and leaves the wrecked Proteus inside him, a loose end the film never resolves.

The novelization sold well and is sometimes treated by readers as the canonical version of the story. Asimov later wrote a sequel novel, Fantastic Voyage II: Destination Brain (1987), that’s not a sequel to the film but a different inner-space story using the same basic premise. Asimov’s involvement gave the franchise an unusual literary pedigree that most film tie-ins don’t have.

The film’s ending is a small letdown. I’d have happily traded a minute of spectacle for a line of dialogue about the submarine left behind, and a novelist shouldn’t have had to clean up an ending the screenwriters walked away from.

Does Fantastic Voyage still hold up?

8/10. The visual design has aged better than most 1960s genre work, the hour-limit structure keeps the tension up, and the body sets still make me happy just to look at.

It loses points from me for the science it waves away and that unresolved ending, and Asimov’s novelization fixes both, so read it separately. Innerspace (1987) is a different take on the same premise. Watch this version first.

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