Fantastic Voyage. 1966.
After a scientist is nearly assassinated, a small crew is miniaturized in a submarine and injected into his bloodstream to remove a blood clot from the brain but problems arise.
I'm pretty sure this film was the inspiration for the 80s film Inner Space but this is more serious science-fiction than comedy, for being a 60s film the visual effects are nicely done, the acting is quite good and Requel Welch in a nicely tight fitted body suit, what more can you ask for.
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