"Zuckerbaby" is about an overweight woman (Marianne Sagebrecht) who works in a mortuary, develops a crush on a married subway engineer (Eisi Gulp), and then does something about it. At first, the love-struck woman is content with just seeing the object of her infatuation. Then she seeks out the train driven by her "sugarbaby" so she will always ride on that particular subway. Next, she goes through a complex series of subterfuges to discover more about him and finds out that his wife will be out of town for a few weeks - which in her mind, makes him "free". Eventually, she does get together with him - but then what?