In this propaganda short, the viewers are taught about how the mosquito can spread malaria. A young mosquito flies into a house and consumes the blood of an infected human. She then consumes the blood of a healthy human, transmitting the disease into him. It turns out that this is actually a film within a film and the Seven Dwarfs are watching it. The Dwarfs volunteer to get rid of the mosquito by destroying her breeding grounds.
- Robert C. Bruce - Narrator
- A scene from this cartoon where one of the mosquito larvae hatches was used in a 1991 episode of the PBS series Shining Time Station during a story about a kid who got sick though here the larvae is portrayed as a germ.