Československá televize

A father/son get-together trying, in their inept way, to do some repair work to their home that they have out in the country.

An interstellar expedition is sent to study a strange planet. Despite the fact that creatures from various Earth time periods inhabit the world, the natives possess metal swords, even though they should have no knowledge of such weaponry.

After arriving at the mysterious castle, the university professor begins to encounter a sequence of mysterious events, to which he reacts with his rational thinking and tries to explain them logically.