Technically, the film is only too obviously under all kinds of strain, as if trying to live up to a budget which it never wanted in the first place.

The lavish production, boasting some brilliant special effects and superior creative efforts, is an entertaining, enlightening excursion through inner space -- the body of a man.

This special effects extravaganza from 1966 has proved surprisingly enduring, despite a technical quality crude by contemporary standards; perhaps it's the screwball poetry of the plot.

With such titles as 2001: A Space Odyssey and Planet of the Apes, the 1960s proved to be a particularly rich decade for science fiction cinema, and Fantastic Voyage stands as one of the period's most imaginative efforts.