A technician working in the telephony company receives a mysterious packet.

The invisible UFO men Giljotin and Orvaskesi land on Earth and take on the appearance of the first people they encounter, Mr. Tossavais and psychiatrist Pehmeäleff. The eccentric professor takes the alien devices he has found to his laboratory, where one of the components ends up with Joona Maaperä, a manager suffering from stress, causing him to behave strangely.

Uuno Turhapuro is a lazy man who abhors manual labor, but has the ability to talk himself out of any sticky situation, usually with his long-suffering wife. In this, his first feature film appearance, Uuno embarrasses his wife in public, tricks his best friend, accidentally goes on a diet, and becomes a famous violinist.

Uuno is unemployed and his friends try to arrange a job for him. With his imagination, though, and the help of Härski Hartikainen (Spede Pasanen), he somehow manages to avoid all work, until he becomes what he has always dreamt of being - a film star. Uuno's father-in-law has other plans for his occupation, though: since Uuno knows the Dandelion, he has potential for a professor of botany.