1980's movie - man shoved inside another man to hide from scientists

Test pilot Tuck Pendleton volunteers to test a special vessel for a miniaturization experiment. Accidentally injected into a neurotic hypochondriac, Jack Putter, Tuck must convince Jack to find his ex-girlfriend, Lydia Maxwell, to help him extract Tuck and his ship and re-enlarge them before his oxygen runs out.

A meditative odyssey through sound and color; finding oneness with the chaos of the cosmos.

Two men trapped in a bunker study surveillance footage of a mysterious police interrogation.

A man investigating an abandoned laboratory finds himself in a particular set of circumstances.

Acting on the Darwin theory, that man descended from a monkey, a scientist experiments towards turning man back to the monkey stage. He inoculates a number of persons with the preparation and after the subjects reach their homes the reversing process begins, and they become monkified. Their antics are uproariously funny. The scientist is unable to turn them back to human beings again, so they are collected in a large cage and places on exhibition. Here they are visited by an ape dressed in human attire. (Moving Picture World)

20 men are chosen to participate in the roles of guards and prisoners in a psychological study that ultimately spirals out of control.

Jack Farley and his family are asked to attend an experiment about social behavior for a planned space station. Therefore they move into an underground dome for three months. But then it turns out that a secret military department replaced the NASA scientists and conducts an experiment on its own...

A British scientist is discovered to have been passing information to the Communists, then kills himself. Another scientist decides that they might have brainwashed him by a sensory deprivation technique, but he doesn’t know if someone really can be convinced to act against their strongest feelings. So he agrees to be the subject in an experiment in which others will try to make him stop loving his wife.

An epic about anthropologists who hunt and capture pygmies for study back in Europe, in an attempt to illustrate the link between man and ape.

A man behaves like a monkey after its brain is transplanted into him.