Shtyrlitz 3: Agent of the USSR – the story of an iconic intelligence officer who encounters alien invaders who have arrived from another galaxy to destroy humanity. The gameplay is filled with humorous inserts and erotic puzzles that have no logic. The main character will go through 33 locations with 5 levels, where he will meet 50 characters and interact with them in different ways.

The story begins with a rocket containing Valentina Teterkina, the first cosmonaut. During the flight, the vehicle encounters a mysterious object. The alien ship was controlled by extraterrestrial beings. After this, the whole world learned about the events, since the incident was shown on all television channels. Each state has nominated its own candidate tasked with solving this riddle. Characters such as Don Pedro, James Bond, Sherlock Holmes, Al Capone and many others were summoned.

The main character has just returned from a difficult mission to save his homeland. However, now he has to achieve a larger goal, competing with other professional agents. The territory of the USSR is under threat of extraterrestrial invasion, and for this Stirlitz will need to prevent the impending threat. The country's leadership sends him to protect the country and show other powers who the real hero is.