You've probably guessed what Electronic is? Right, he's a boy-robot! But the cream of the joke is that, by sheer chance, he turns out to be the live double of a schoolboy, Sergei Cheesekov. They meet and make friends - and immediately fantastic and funny adventures happen to them both. Sergei quickly gains fame as a World Champion runner, an animal-trainer, and an honor pupil at school - but that's enough. Read the book yourselves, and join Sergei and Electronic at a math lesson in a Moscow school, see the circus with them, and visit the cybernetics laboratory of Professor Gromov. Finally, when the cat's out of the bag, and their secret is discovered - join the children who teach Electronic to laugh. Wouldn't it be fun if you had a friend like Electronic?